Yama no Susume: Omoide Present

For an anime that's usually about climbing mountains, making memories, overcoming struggles and accomplishing a dream, Omoide Present is a meandering stroll without a destination, the sounds of the park, a lost child, a broken promise, self-reflection, a desperate late-night room search, old photo albums and old memories. But of course, we go full circle, and in the end find, a promise kept, a child found, new promises, and the chance to make new memories. The cycle of overcoming and accepting the past and looking towards a bright future. It's sentimental and beautiful. And you couldn't ask for anything more from an OVA setting us up for the third season. Thematically, it's perfect for this purpose.