Hyakunichikan!! - Vol. 1 Ch. 6

[MangaDex]

 

[Glomoro]

That art with the skeleton and woman dancing or whatever is from here if anyone's curious
https://www.pixiv.net/member.php?id=1980643

 

[Ced1106]

FBI's recruiting them pretty young these days.

 

[Darkmeep]

 

[Fui-nee]

If she want little sibling she can ask her parents, but if older siblings? Adopt?