As Kusuo Saiki's Little Sister, What's Wrong With Being a Little Selfish?

As the third daughter of the Kusuo family, Kusuki Yuko always thought she was perfectly ordinary, the kind of person who could make it from beginning to end of a manga without having any presence or even appearing in a single panel.

But she was wrong. Her mother's excellent genes still flowed through her. After she accidentally fell into a space-time rift at sixteen, she somehow became the ultimate boss in every world.

Fine, she was partly responsible. But her eldest brother was Kusuke Saiki, and her second brother was Kusuo Saiki. Why should she care what anyone else thought?

If someone got in her way and annoyed her, of course she'd kick them aside!

"Big brother! I don't want my cutie to appear in this world!"

"...It's taken care of. Go play as much as you like." But do you really think the Kira you unleashed is a cutie?

Theme: In the end, family really is what matters most. Sob.