Okitsune-chan ni wa Seishun ga Tarinai

Whenever Kohaku's emotions show, she turns into a fox. So even though she entered high school, she still has zero friends! In an attempt to become closer to her, the super popular Inui-senpai at school suddenly approaches her!? She shouldn't be excited! But she can't control her feelings!? (Source: Flowercomi Like, translated)