SI-VIS: The Sound of Heroes

People seem to miss the memo for this show. They think its only a show about fighting with the power of song. But if they think that, they miss the full story. It is about showing humanity can pull through together, even in the worst odds, as long as the intention is positive and true. It's not meaningless combat. SI-VIS does go overboard with character tropes as some of the reviews have pointed out. But, they did resolve themselves over time. If you can pull through the rather excessive character trope slop of the early episodes, you get properly rewarded with the show re-railing itself. It gets back up on its feet, reducing the impact of some character tropes. It changes focus and corrects its direction and pacing around the midway point. Towards the end of the series past EP 17, SI-VIS truly shows its colors and the writing solidifies itself. While saying that, I believe they had designed and written the series to be two 12/13 episode seasons; but they ended up getting a full 24 episode season in one shot. It may explain why some of it seems rushed in the first half, and yet can help explain the change in tone and pacing found past that EP 12/13 point. It's worth noting that even with the series rough starting episodes and first half, It does properly entertain along the way and even then with its highly predictable dramatized tropes manage to break what you expect the character or show to do. It manages to include quite a few subversions of expectations that later prove to define the characters growth over the series, all without making the show seem like it lost its direction or had a rewrite midway. It also lacks any filler episodes. No episode lacked plot or purpose. The characters are properly enjoyable, mostly stay on theme, and are relatable. It brings real but heavy topics to the table, and handles them all excellently. Its a love letter to hope in humanity on par with Superman... Well, If Superman was an Idol group. The show properly covers having a Gray Antagonist faction and characters. The conflict is not the one you first expect it to be. Everything, even the villains, stems from misbelief, and grief; which the show properly covers and shows that you can work through issues. Even if they regress, the show characters must pick themselves back up. And they do, excellently. Animation remains consistent throughout, and the audio design is unbeatable. Songs strike powerful emotion when needed. Characters gradually lose their comedic/dramatized tropes and grow out of their first impressions shell. The finale episode is proper, fulfilling and is left open ended for headcanons and fanon interpretation; as well as potentially gain a second season/series. It also properly sets up the series to be a multimedia concert franchise like how Symphogear or Uma-Musume is. Overall, SI-VIS has a more proper lead up to a more deserved and rewarding finale than most other series I've seen this 2026 Winter release. It's able to wrap in the viewer with lessons of hopecore and yet admits that in despair you can be blinded to the chance in front of you.

Had this aired in the 2000s or early 2010s, it'd be one of the classics for sure. The main cast is very standard in their roles and arcs, but the villain cast, while joining late, is interesting and flavorful in a way that heightens the overall show. There's respect and love put into the villains, so they feel like characters just as much as the main cast. Episode 21 and 24 showcase that, without respect for the antagonists those episodes couldn't come to be. The animation doesn't knock it out the park 99% of the time, sadly, but the voice performances are incredible throughout. In particular, Sakura Ayane shows the best performance I had the pleasure to hear from her in Siren, and I can only hope they give her more roles like this going forward. The twists in the script are pretty efficient and can even be surprising at times, but, like the characters, are mostly straightforward as you'd expect from a show like this, but I always appreciate a story that goes beyond winning/losing, killing/dying, and manages to make its battles about something of greater or smaller scale. There are about two songs which didn't land well with me, but all the others are certified bangers which can carry the emotion the animation may fail to for some big moments. Personally, coming out of a music series not interested in hearing any of the songs is what I consider a death sentence, and SI-VIS delivers from EP1 to EP24 in the musical department flawlessly. PS: They don't let the lesbian confess her feelings, but the MC also doesn't, so while I wish she did, I feel they just stayed true to their setting of "idol industry" and didn't let the "fans" find out who's dating who, and I can forgive that.

As an anime, it's entertaining. As an attempt to promote a new musical unit, it's a failure. Si-vis started with a fairly solid first episode, introducing us to many aspects of this world: Si-vis's main band, the fight against creatures called "Xenos," and a magic system based on audience support. It even shows us that in this world, danger is real and anyone can die. After that, the series becomes quite flat. It has interesting moments and a few songs you might like, but nothing that will blow you away. As an anime, it has interesting story points that you can find entertaining to a certain extent, especially the plot. While it's not a story you could call a masterpiece or a hidden gem, it has something that keeps you watching the episode, whether it's to hear a new song or to see the decisions each character will make. In the second half, there's a conflict between both sides, where feelings of resentment, revenge, and coexistence begin to intertwine. It's not bad per se, but it doesn't quite fit with what was presented in the first episode. All the sense of danger they create at the beginning disappears in the rest of the episodes. They prefer to replace death and bloodshed with the power of understanding and friendship. The ending is quite bad, since they resort to the cliché I like to call "They pulled a Black Zetsu." That is, the strongest villain isn't the final villain, because a new one pops up out of thin air because some writer didn't know how to defeat the first one. This somewhat ruins the experience because the real villain has a mediocre ending where he has to be redeemed to set up the end of the story. On top of that, the anime has a super forced love triangle that is never resolved. Musically, the songs are good when you first hear them. The problem is that the anime overuses them. There are only about 3-4 songs. In a 12-episode anime, it doesn't feel heavy, but in a 24-episode one, it's very repetitive and gets tiresome. It feels like you're listening to a song on a one-hour loop. Eventually, it gets tiring and a little nauseating. The same thing happens with Si-vis. The songs are repetitive; you get to the end and feel like you've heard "Melodea" and "Braver Dreamer" hundreds of times. Because of this, it doesn't generate any curiosity in the viewer to seek out more about the band. You feel like you've already heard it all. You don't have that interest in hearing anything else from the band. Si-vis got lost halfway through. It didn't know if it wanted to be a serious story, a musical, a battle film, a war drama, or a teen romance. All I know is that it tries to cover so much ground that it ends up accomplishing nothing.

Honestly one of the worst things I ever watched, absolutely horrendous work that will punish you for paying attention. Let's start with few good things it has to offer before diving into the abyss. Sound of heroes is a proper name for what it is: a story about people who fight dark forces alien to reality with music and open hearts. The whole thing with Xenos attacks is a very good setup for some drama, and the story about secret force protecting to earth and all of that. Protagonist's dramatic reality is also a very good start for the story about legacy's weight and expectations. Seyu worked as if their life depended on it, some scenes work on voice acting alone. Now, let's start with why it's a 1. Most characters here are flat as a sheet of office paper, archetypes at most and pictures that will say what poorly written scenario wants them to at worst. They don't act naturally, their development and relationships are forced and don't make any sense, they are tweaking 24/7 out of the character and it really shows. From having doubts to accepting as a leader in one nothingburger scene, from being calm and collected to "I will throw my friends under a bus to murder my enemy" in two seconds and then to acceptance and forgiveness of the said enemy in one narutotherapeutic talk. The genocide is stopped by a single smile, no joke. Music and choreography is laughably bad for a music centered anime. Despite the fact mc is praised for his dancing, all the dance we see is a poorly animated generic idol dance at episode one. That's all, even tho we hear people commenting his dancing, he doesn't actually dance once after that. SI-VIS songs don't sound like something produced by the same band at all. Singers dont have voices even near their character's VAs which makes it about impossible to guess who's singing without looking at the screen. Songs themselves are forgettable and not catchy at all, which is bad in itself but it's even worse if we consider in canon they're a world class idol group who is universally beloved. Also the most abhorrent thing is how music isn't tied to anything happening on the screen: people don't fight in tact, lipsync is off, canonically acapella songs still have instrumentals and that's on top of them reusing same three songs over and over and over again. The scenario is bellow all praise. Before watching this I strongly suggest you put on safety gear to not traumatize yourself in agony. Even putting aside characters themselves, you'll have the worst ride in quite some time. We have the "pulled from someone's ass surprize villain in last two episodes", forced romantic line that goes nowhere (even two of those!), absolute misunderstanding of their own work by the authors considering how convulsing is the constant change of the main story's direction, erasure of any stakes, poorly written fakeout deaths, telling us tall tales about characters without showing any of it... Then to be pedantic we can address the amount of plot holes that'll make a wheel of cheese envious like them making phone calls to another galaxy, magic FBI having absolutely no security at all in their headquarters and accepting random pale clearly alien people on jobs, world level idols walking around all the time without any bodyguards and not being perceived, alien creatures not knowing humans for a week being able to hack supercomputers and so on and so on... Once in a long while SI-VIS will throw your way an insult in a form of a really good scene. Well thought out, well acted, well animated. There's 4 of those. That actually made it even more miserable for me. It felt like producer really put in the effort to rub in our faces how it COULD BE if anyone really gave more than zero ducks about the title. Let's summarize: awful script, animation, choreography, characters, music and it's implementation and on the other half of the scale four good scenes, Apolo and one good song that feels completely alien to everything in this anime. Should you watch it? I would strongly advise against it. SI-VIS: sound of heroes — is when you get an invitation to a romantic dinner but find yourself with three stab wounds in a shit filled ditch.