take on me

An ero manga by Takemura Sessyu, chronicling the misadventures of the short-statured Tsuda Tomonori, right after the fateful incident of accidentally photographing an upskirt of Oono Hikaru, their class' tallest girl.

From there, it gets kinkier - involving toys, twins, rivals, Hikaru's older sister Kei, and lots of anal.