Kareshi Tokidoki Kanojo

The romantic comedy manga's story centers on Hodaka Akizuki, a 17-year-old high school student, who falls in love with the school madonna Chihaya Shishizaki. Hodaka bravely confesses to Chihaya, and they officially become a couple. But Hodaka actually keeps an unimaginable secret, even from his girlfriend Chihaya.

(Source: Anime News Network)