Project SekaiFanfic, x Reader & AI Roleplay

This work is a rhythm and adventure game featuring six Virtual Singers—Hatsune Miku, Megurine Luka, Kagamine Rin, Kagamine Len, Meiko, and Kaito—alongside twenty original human characters divided into five themed units. The story is set in a real world where Virtual Singers exist only as fiction, and the characters come to encounter another dimension called "Sekai," which is born from each person's true feelings. The game draws on a wide variety of Vocaloid songs as its subject matter.

The appeal lies in how each of the five units presents characters with distinct relationships and personalities, combined with the scenery of "Sekai" depicted through individual songs, resulting in a wide range of narrative expression. Because so many different Vocaloid songs are used as material, players can enjoy how the original songs' atmosphere overlaps with the characters' own stories. The dual structure of the real world and Sekai serves as the backbone for depicting the characters' relationships and growth.