Mitsu became a college student while dragging along the trauma of her first boyfriend and a broken heart in her years back in junior high school. She was thinking about going to college and finding a new love, but the person in the room next to hers is Kaede, her ex-boyfriend! It had been 5 years and he has become sophisticated and grown-up, but his gentle smile has not changed. Mitsu wants to forget her old love and enjoy university life, but she finds herself trapped between her grown-up ex-boyfriend and her best friend.