Shougakusei ga Mama demo Ii desu ka?

Tokuyama Takehiro is a young game programmer who has taken on his first big project as the lead programmer. Not only that, but he also has a double duty as the project's director. He finds the stress of his first big project overwhelming, and he ends up eating at a local okonomiyaki shop as his solace. There, he meets a precocious young girl who seems to take an instant liking to him and seems to know far more about him than anyone should, except perhaps… his dead mom?

(Source: MangaDex)