"I'll teach you how to kiss like an adult." Ruisa is a housewife who starts working part-time at a convenience store. Living an ordinary life with a cold relationship with her husband, Ruisa meets Haruto, a college student working at the same store. While being taught the job by Haruto, Ruisa becomes attracted to his seriousness and overflowing cuteness. To make sure Haruto never leaves her, she repeatedly kisses him and acts like a nympho inside the convenience store, in the break room, and at love hotels. Haruto gradually falls deep into the swamp of her intense kissing, where his lips are sucked, they share deep tongue kisses, and both his lips and tongue are licked and devoured in saliva-drenched, passionate kisses...
