A Story About a Girl who Betrayed her Loved One, Only to Spend her Days in Redemption, Regret, and Despair

One day, Fuyuki witnesses his childhood friend and fiancée Itsumi Sere having an affair with his other childhood friend, Kiryuu Yuudai. Fuyuki caught them in the act and ended his relationship with Sere, but it left him with a serious psychological scar. Sere regrets her mistake and tries to start over with Fuyuki in despair. It’s a common story.