Kasumi Sonoda struggled with an issue: she couldn't feel pleasure from sex with men. When she confided in Aizawa, he advised her to be true to herself and suggested they try being intimate together. Kasumi discovered genuine joy in this first experience. Later, when she visited Aizawa again, she encountered another woman named Kyoko. This marks the beginning of a complex three-way relationship in "Kasumi, the Teacher, and Kyoko," along with two additional stories. A new installment in the Cat and Tachi series.