Akasasu Sekai de Kimi to Utau | Korean

Akasasu Sekai de Kimi to Utau or Akaseka is a Japanese style otome game developed by otome game studio GG Studio.

Players take the role of a girl who stumbles across a parallel world that has no sun. In this world where darkness dominates, aragami attack the protagonist and this prompts her to become a shrine maiden. With the help and the power of 60 handsome historical figures, the girl decides to begin a journey to awakening the sun.