Once known as the "Love Master" for her proactive approach towards romance, Kamoi Hiyori becomes timid after a traumatic breakup with her university boyfriend, Sudo Kei. However, her life faces a drastic turn when she suddenly timeslips back to four years ago, when she was still a university student. Reunited with Kei, Hiyori vows to not date Kei again but her heart begins to waver after experiencing Kei's kindness and thoughtfulness she did not noticed before.