Danchigai: Everyday Life – Part IV

Haruki Nakano and younger sister Satsuki looking toward the screen with fists raised in anticipation

Haruki Nakano and his little sister, Satsuki, get along well, sharing an interest in manga and anime, but she spends most of her time with her twin sister, Uzuki.
From the anime series Danchigai


Danchigai: Everyday Life – Part III

Haruki Nakano looks at some papers after having some sense knocked into him by his younger sister, Yayoi

Of all the siblings, Haruki Nakano and his younger sister, Yayoi, fight the most — she hits him or puts him in a wrestling move whenever he teases her or allegedly acts perverted. Still, despite their constant squabbling, they really do care for one another.
From the anime series Danchigai