After being transported to another world, Mizusaki Yuuma looked at the newly released "Love Metronome" and realized it was a sweet slice-of-life romance anime. However, he encountered a girl collecting Clow Cards, a pile of scrap metal collecting the Peace Star, and a Sherlock Holmes from the Heisei era. He also occasionally heard urban legends about Tomie. Fortunately, his Yorozuya (Odd Jobs Shop) always attracted strange customers who traded things from other worlds with him. There was the Battlefield Rose from the ninja world, a rebellious girl from the world of navigation, a fox spirit from Valoran, and a girl visited by eight million warriors. Kasumigaoka Utaha: Hey, you have to take responsibility! Kinomoto Sakura: My brother is so nice, he helps me collect Clow Cards. Irelia: Grandma always says... Mizusaki Yuuma: Stop nagging Grandma, when are you going to pay back what you owe? In the corner, Mai Shiranui, remembering she still owed money, was trembling. ...

My name is Luo Chen, and I traveled through time.

That's right, I was just an ordinary Hyperion deck cleaner. But why did I end up in the world of Honkai Impact 3rd? I can live with these familiar girls, but is this really the Honkai Impact 3rd I know? How could this be so outrageous!