It tells the story of Onodera Machi who was a teacher at the high school she once attended, and a handsome transfer student Chiba Yuuto came to her class.Yuuto is the younger brother of Chiba Yuichi, Machi's first love in high school. He looks almost exactly like Yuichi in high school.

Memories of her first love came to her mind, and she met Yuyi again by chance at a cocktail party.Every time she sees him, she will think of her first love. She gradually cannot take her eyes away from her younger brother Yuuto and her first love Yuichi whom she admired in high school...