Hozuki-san Chi no Aneki + Imouto

A while has passed since the conclusion of Hozuki-san Chi no Aneki, (+Imouto) returns to the prank-filled life of the perverted siscon, Gorou, and his older stepsister, Haru. However, Haru's cousin comes to visit, and suddenly Haru is faced with the loss of Gorou's (seemingly) endless devotion.