A school life filled with loneliness, zero luck, and no social connections, Yumi’s childhood was nothing but a dark and miserable past. Now 28, she has finally overcome her embarrassing history and is living a happy, fulfilling life. But just when everything seems perfect… she time-slips back to her most unfortunate past?! Caught between the last love she left behind in the future and the forgotten first love from her past, what will she do?