Read manga: Doubt! (Amano Sakuya)

manga
Artists: AMANO Sakuya
Status: completed
Latest chapter: Chapter 31
Updated at: Apr 17, 2022
Summary:

Ichiru Kanzaki is given an offer he can't refuse: to clear his entire debt, he has to enroll in the high school where his father works to track down his father's illegitimate daughter, his own younger half-sister, whom he has never met. But which girl is she?