jemuzu

Sora and Shiro are a pair of siblings, brother and sister, who are well known as brilliant. Yet they are NEETs - useless to society, and (Not in Education, Employment, or Training) - and even worse they are completely house-locked shut-ins (hikikomori!

The main character Suzukaze Aoba graduates from high school and joins a game company. The person who made the game that Aoba loved as a grade-schooler just happens to be Aoba's senior at the company.