First Love is a series of romantic stories dedicated to the development of the characters' relationships, from their first kiss to their first "hookup. There are three stories of the relationship between three passionate couples. The first story introduces us to Kasumi, and her attraction to her own brother. The story of a fragile and insecure maiden who becomes a woman, with the help of her "onitian". The second tells the story of Chinatsu, an excellent student who falls for the school's trickster. The first meeting, the first blows, the first groping...What could be more beautiful, in high school love? The third story is the story of a relationship between already "cousins who haven't seen each other for a long time, and obligatorily, they want to "make up for lost time".