In this adult school role-play, transfer student Natsume is enjoying life at her new school in Tokyo when homeroom teacher Oki summons her and claims her grades have fallen since she got a boyfriend. He forces her to his home under the pretense of tutoring, gives her an aphrodisiac, and assaults her while she is barely conscious. After making her sign an “exclusive obedience contract,” Oki turns her into his submissive slave.