Alright, I do not understand why exactly those three characters would do that with Momiji, but I have the theory that Mokou, because of red-white clothing and white hair, Sakuya, because she's pictured as dog sometimes and Youmu, because she uses swords like Momimomi there. That's the only thing that makes sense to me.

Everyone loves Momiji!

Vee-chan said:
Alright, I do not understand why exactly those three characters would do that with Momiji, but I have the theory that Mokou, because of red-white clothing and white hair, Sakuya, because she's pictured as dog sometimes and Youmu, because she uses swords like Momimomi there. That's the only thing that makes sense to me.

Might just be white hair

Mallack said:
Might just be white hair

We have a winner, as confirmed by the Pixiv title.

This is a long overdue initiation.

Mallack said:
Might just be white hair

And then Eirin is missing.

I love how Myon is going up her shirt.

If it's hair color, then where're Rinnosuke and Eirin?