The Young Master of the Yakumo Family

As the younger brother of the eternally seventeen-year-old peeping tom, er, I mean, the eternally seventeen-year-old sage of yokai, Yakumo Yukari, Yakumo Mo felt an enormous amount of pressure.

At least he didn't have to worry about his big sister using his face as a keyboard or anything, but...

"Mo, you were definitely thinking something terribly rude just now, weren't you!? The boundary between wave and particle!"

"No, please, Big Sis..."

Boom...

Blasted all the way to the Forest of Magic, Yakumo Mo stared at the black and white figures before him, completely dumbfounded.

P.S. This is really just the everyday story of a newly born boundary yokai who became Yukari's M brother, hanging around Gensokyo and occasionally visiting various anime worlds to watch their protagonists in the most inhumane way imaginable.