Help me, ERINNNNNN!! (Game Size Ver.)

Official collaboration between Project SEKAI and COOL&CREATE, released to promote the former's "Touhou Collaboration" event.

Help me, ERINNNNNN!! was a preexisting song performed by COOL&CREATE, originally composed by ZUN and arranged by beatMARIO. The song was re-arranged by beatMARIO and Maron, and released digitally on May 3, 2024. The VIRTUAL SINGER version was added to Project SEKAI as part of its "Touhou Collaboration", alongside a re-arranged version of Saishuu Kichiku Imouto Flandre S (also by COOL&CREATE) and Bad Apple by Alstroemeria Records. (Source: Project SEKAI wiki, edited)