100 Subscribers! FAN CHOICE SERIES! Submit your suggestions! (Pixiv Fanbox)

We just hit 100 subscribers! (Actually we hit it a week ago but I've been too busy to make a post about it) To celebrate, the girls want to do something special for all of you, a fan-choice series!

So in the comments below, give me your ideas for a series! (One per user. If you try to give me multiple ideas I'm just gonna take the first one you submit.) After a few days I'll make a poll where you guys can vote on what you'd like to see the most!