Sumire, a high school girl and kendo club member, is known for her dignified presence in her keikogi uniform wielding a shinai. However, she is stalked and kidnapped by a creepy man, who imprisons her in a filthy room. There, she is sexually trained as his personal fleshlight. Trapped with no escape, she faces a grotesquely thick, erect cock thrust directly at her. Her mouth is repeatedly pounded, slowly drowning her in overwhelming pleasure. Though she acts bold when holding her bamboo sword, as her clothes are stripped away, her voluptuous skin and cute, shapely breasts are fully exposed. Thrust after thrust by the man's monstrous cock, the kendo girl is pushed into unprecedented ecstasy, descending into depravity.