Atsushi, a student, instantly falls in love with Maki, a married woman who gives up her seat to an elderly person on a crowded train, and sees her casual actions and smile. Atsushi, who does not know his address or name, follows Maki and finds out her name, address, and family environment. Atsushi, who began to act like a stalker, exploded in his desire to touch Maki's skin and created a super powerful aphrodisiac. Then, in a crowded train, he slowly inserts his fingertips covered in an aphrodisiac into Maki's pussy...