Natsu Kuyuru Sukimono no Yado

Miharu, an otaku boy who works at a ryokan in a shabby hot spring resort town, is living with Fujio, the son of the ryokan's heir and a former porn actor. While Miharu wants to rebuild the ryokan, Fujio does not seem very interested. One day, when Miharu is planning to attend Comiket, he is invited to Fujio's other house in Tokyo for the first time...? A sexual love diary of an ex-porn actor and an otaku boy.

(Source: Shinshokan, translated)

Note: Includes an extra chapter.