Eager to earn a little extra money, office clerk Saki Watase signs up for a product‑review scheme. Yet the first item her new side gig sends is an enormous box of XL condoms, and Saki chooses to skip the assignment.
Later, at a staff‑only bash with colleagues—including her sharp but exasperating "demon boss" Keisuke Sudou—Saki gets thoroughly intoxicated, prompting Keisuke to offer a ride home. When they reach Saki"s flat, he instantly notices the large pile of XL condoms she carries. After she explains her part‑time role, Keisuke proposes to assist with the testing—discovering he himself is XL!
