Senagaki Isaku will be a first-year high school student starting in spring. Her grandfather is the third head of the Senagaki group, a yakuza organization, so she is feared by those around her. However, starting from spring, she hopes to make normal friends and normally fall in love. She is admitted into a high school further from her hometown, however, the overprotective young head of the Senagaki group, Utou Keiya, (26 years old) falsifies his age and enters the school with her through a backdoor admission…?! Keiya proclaims that love is too early for her although Isaku is perfectly ready. In truth, she has held an unrequited love for Keiya for quite some time.

Minato is a university student and has a fear of germs. She isn't interested in looking pretty. She lives with her stepbrother Toru, who is her stepbrother from her mother's remarriage. Meanwhile, Toru is handsome and a player with the ladies. He doesn't resist women who come on to him and he doesn't stop women from leaving him either. Minato is uncomfortable with Toru and his ways with women. They are the same age and attend the same university. They have an agreement, where Toru will not approach Minato within 2 meters when they are outside. One day, due to her friend’s request, Minato puts on make-up and wears her friend’s high school uniform. While she is out walking in public, she happens to meet Toru. She unexpectedly lies to him about her identity and tells him that she is a high school student. Toru falls in love with her at first sight.

Minato studies piano at a music academy. One day, he falls head over heels in love with fellow student Yukino, who harbors a tragic secret that will put their romance to the test.