This might sound stupid but...

[HostilCobalt]

What is uboachan ? Could we create an account here ? How ?

[Damation]

It is the true part of Poniko, its most recondite and obscure but true part.

[Spectral_Orion]

It's a Yume Nikki fansite that is structured very much like four-chan. You'd have to go there to make an account.

[Cap'n Berrosuke le Absynthe]

It's an anonymous image board for fans of Yume Nikki.

[EverDownward]

I'm actually kinda surprised uboachan is still active. I remember going there back in 2010.