Wow. I really like this picture. A lot of detail.

how did tenshi even get her hand on that

better take little Ika with you else she ended as tenshi's pet, we don't wanna see masochist little Ika,right?

Actually mini-ikamusume has the ability to transform herself into a squid-hat, and then she'll attack any innocent girl and..
Voila! A new invader has been born!

lol dat Ikamusume >w<