Kareshi Tokidoki Kanojo

Hodaka Akizuki, a high school student just turned 17, met the school's madonna, Chihaya Shishizaki due to a certain turn of events. Prepared to be shot down, he gambled it all by telling her "I love you. Please go out with me!" And that how they started going out. But Chihaya has a secret Hodaka cannot even imagine...? A kind of love changes everything. The curtain raises on a new frontier in shonen love comedy!

(Source: Kodansha, translated)