Nyuugaku Omedetou ~Hajimete wa Osananajimi~

Protagonist Takahiro has been working for two years.
On his day off he's lazing around the house when an old childhood playmate,
the perky girl next door named Nao, comes to play.

It's been a long time since Takahiro saw Nao,
and she's surprisingly mature!

[From DLsite English]