OVA
Description
Mikazuki Kiryū is a 14-year-old second-year middle school student and the younger sister of Yūzuki Kiryū. She is one grade below Keita Suminoe and was in the same sports club with him at his previous school.

She has a short, slender build, blond hair tied in twintails, and maroon eyes, contributing to her peppy and outgoing appearance.

Mikazuki is peppy, outgoing, and more cheerful than the rest of the cast. She shamelessly pursues Keita, openly stating this on multiple occasions. In her efforts to gain his attention, she acts more lewdly than Ako and Riko Suminoe, flashing her underwear at him in front of others or even offering to let him lick her private parts.

Despite this behavior, she also exhibits a mature and level-headed side that occasionally surpasses her older sister, such as logically stating that Ako and Riko were too much to handle after they locked Miharu Mikuni and Keita in the gym. She displays air-headed tendencies and often jumps to conclusions, like believing Mikuni and Keita were no longer virgins after finding them hugging.

She deeply loves and looks up to her older sister Yūzuki, privately calling her “my otaku sister.” Mikazuki has covered for her sister’s otaku habits by claiming purchased eroge games were for herself, though she enjoys taking lewd pictures of Yūzuki in cosplay as compensation. She correctly assumed that her sister has feelings for Keita.

Although interested in Keita and having joined the track and field club because he was in it, she seems equally amused by watching the antics and reactions of others as in actually winning him over. She considers Keita and Yūzuki well-suited for each other and enjoys watching them try to act like a normal teacher and student. After a group trip to the beach, she appears to develop some feelings for Keita herself. She shares a certain genetic condition with her sister that is revealed when the girls bathe during the beach trip.

She lives with her parents and is the shortest character in the cast. She persistently refers to Ako and Riko Suminoe together as "Akoriko-senpai," which annoys them.

Her given name, Mikazuki, means "crescent moon," and her surname, Kiryū, means "paulownia."