This book is also known as "I Do Whatever I Want in the Honkai World," "The Herrscher of the End Wants Me to Build a Harem," "Honkai Simulator? I'll Go For Real," "Challenging Seven Valkyries in One Night," and "Durandal in Training." As a white-collar worker, without shaving, I came home from get off work to find a beautiful girl I'd picked up. It turned out to be Kiana, my wife whom I'd watched grow up?! After living with her for a while, I was transported to the Honkai world after the main storyline ended. Surrounded by Herrschers and S-rank Valkyries, my work turned into spending every day with my wife?! And what's even more outrageous is that they, whom I have a lot of affection for, actually want to help me grow my harem?! Every morning I wake up to see Mei on my left, Yuexia on my right, Airi at my left foot, Rita at my right foot, and a big duck in my arms! Then I try every possible way to "act unreasonably," but they all willingly satisfy my unreasonable demands. Even if I said Mei was bouncy in front of Kiana, let Bronya answer the phone while I was on a date with Seele, and even made Ellie only watch me and Eden...

When the card collector arrives in another world, he discovers that all the cards he needs to collect are beautiful girls. "Welcome to the true Great Millennium World!" — "Collect your own cards and challenge the will of the world!" — "Let me introduce myself, my name is Itsuka Shiori, a second-year student at Zen High School. What about you?" — "Collection target discovered: Itsuka Shiori. Card strength: 1 star (Can???)" — Intimacy? Embarrassment? Loyalty? Trust? What the hell are you trying to do?! Shikimori Kaede's collection challenge officially begins! Infinite flow, crossover anime, quick transmigration, multiple dungeons, not all combat.