Minoru, who attends yoga classes just to see Hasumi-sensei's well-trained, firm buttocks, buys a pair of glasses that are said to let him see through things online. He takes them to yoga class right away and tries them out, only to find that Hasumi-sensei is completely naked right in front of him...! Minoru obscenely stares at Hasumi-sensei as she poses with her anus wide open, a composed expression on her face. He gets a taste for it and then buys a time-stopping stopwatch and a brainwashing light. He uses these three items to play with Hasumi-sensei's naughty athletic body to his heart's content!