Saeki, who started a delivery part-time job two months ago, is intrigued by a customer named Yuuki, to whom he delivers packages about twice a week. Not only is Yuuki a giant, timid hikikomori... but it seems he has a crush on Saeki. However, Saeki, who is gay, prefers "slender, small, and cute boys." He felt no attraction whatsoever to Yuuki, who is the complete opposite of his type—but one day, he accidentally catches Yuuki masturbating in his room, moaning Saeki's name in ecstasy...!? A size-difference love story that flips sexual preferences upside down, featuring a secretly sadistic delivery worker × a super masochistic body with a natural sweet personality ♡

Original: cmoa | Renta JP

NOTE: Originally released as a oneshot in 2022 the series has now gotten a continuation as of 2024.