保健室のオトナな先輩、俺の前ではすぐデレる

Yuzuki, a senior member of the school infirmary committee, has a gentle and mature demeanor. Kyoji, a regular in the infirmary, got to know her as she teased him every day. He wanted to get back at her, so he said, "I like you..." When Yuzuki heard that, her behavior went haywire!? (Source: Fantasia Bunko, translated)