Des:Natsume, who transferred to Tokyo, was having a fun school life. One day, his homeroom teacher, Oki, calls him and warns him that his grades have been declining since he got a boyfriend. Natsume is forcibly invited to Okis house to watch him study, and forced to drink an aphrodisiac, and is raped by Oki in a hazy state of mind...Natsume is forced to write an ``exclusive obedience contract to Oki. Falling into slavery...