Sankaku Renai: Love Triangle Trouble

Meet Sousuke, our protagonist. He's just your average student, living in a rural town. Ever since his father remarried when he was young, he's been living together with his little sister Nanaru. Together with his childhood friend Maho and their other friends, they have fun geeking out at school in the Otaku Club (or the "BC," as they like to call it). Sousuke enjoys those tranquil, peaceful days... But then one day, only one month before summer break, that peace is shattered. "I've missed you so, so much... Nii-san!!" It's his blood-related little sister! His beloved little sister, who had gone with their mother after the divorce, and she's…