お隣さんの夜の顔

"How much do you know about your neighbor?"

Kirue Kiryu... the breath of fresh air who lives next door.

Yukio (protagonist) and Kirue cross paths daily, but recently they've become closer friends.
But Yukio then saw a side of Kirue he shouldn't have...

Certain circumstances led Yukio to a paid sex house, where he discovered Kirue was working at night.