"The Sin of the First Love Thief is Heavy" In an aristocratic school, students create families among themselves and compete for a more family-like atmosphere in a 'Pseudo Family Project.' Waiting for Haruka, who entered as a stand-in for the role of 'father,' were the charming and mysterious 'wife' Murasaki and a group of uniquely individual children. A false self and a false family, yet the feelings that blossomed were genuine. This is a collection of short stories from 【O-Papa Goto】 depicting the bittersweet first love of 'daughter' Ayumi and the happy daily life of 'wife' Murasaki. It is a bonus book that compiles the manga published on Nico Nico Seiga and Twitter, along with numerous illustrations for store bonuses.