Saito is tutored by his friend's wife, Eimi, for studying for the Kanji Proficiency Test. For Saito, who has been looking at Eimi with lustful eyes for some time, this is a golden opportunity. And as soon as he is alone with Eimi, Saito involuntarily gets an erection. Meanwhile, Eimi starts masturbating next to Saito, repeatedly teasing him. Saito sees his friend's wife getting lewd right in front of him... Later, Tanaka, who heard about it from Saito, also visits the Ishikura house.