Masuda Tsuyoshi

While waiting for his late friend at their meeting place, Yuichiro is suddenly dragged to a hotel by a high-spirited girl named Sachiko. Though he was swept away by the situation, Yuichiro is tormented by self-loathing, and Sachiko tries to act cheerful in front of him, but she overreacts to his simple "do your best." With a desperate look on her face, Sachiko pulls out a mysterious medicine from her bag...

Associate Professor Ogino, an animal behaviorist, specializes in reproductive biology! Haruka, a graduate student who lives with Ogino, and the members of the Ogino lab are constantly researching animal sexuality! By the way, do you know what happens to female ferrets if they don't mate during their estrus period?