My happy daily life crumbled with a loud noise――. Akane, who moved to the countryside, meets irreplaceable friends there. She spends her days in happiness, but due to not writing in the class diary, she is killed by her friends as a punishment game. When she realizes it, she finds herself back on the first day of school. The mystery of the time rewind, the resurfacing memories, and the friends who are changing dramatically... Betrayal and shock, an incomprehensible mystery swirls in this time leap suspense!