Honnou Level de Aishiteru

Chiho, a second-year high school student, is childhood friends with a handsome, slightly overprotective Shion. Shion has a special constitution called "alpha" and is a super-perfect person from birth. On the other hand, Chiho is an ordinary person called "beta," but a certain change appears on her birthday—?!

(Source: Starts Shuppan, translated)