Who is Yakushimaru Ritsuko?


At the beginning of episode 3, as _Mikatan_ brings a Christmas tree into Ito's
room, this conversation happens:

> **Ito:** Wh-What is that?
>
> **Mikatan:** Isn't it obvious? It's Yakushimaru Ritsuko. Oh, I mean, a
> Christmas tree.

![](https://i.stack.imgur.com/dB4NB.png)

Who is Yakushimaru Ritsuko supposed to be a reference to? Does the real person
has anything to do with the context here?

