What Was I Meant to Call This Mess That Wouldn't Go Away?

Synopsis

The world is filthy...

Nakayama, a high schooler with an extreme case of germophobia, just wants to enjoy his own peaceful time in a perfectly clean space, away from everyone else. But his quiet life is constantly thrown into chaos by Nishino, the cheerful, albeit messy girl who just so happens to sit next to him.

"Don't pollute my sanctuary!"
"Don't mess with my alone time!"

Despite his desperate pleas, the madness continues.