Based on the erotic game Zoku Hitou Meguri by Riddle Soft. 

Mao, who has a secret crush on Mikio, makes up her mind and invites him to go on a trip. The invitation gets accepted, and at the thought of the trip just for the two she feels elated. Mikio falls asleep right after installing himself in a seat opposite Mao in the train, helplessly spoiling the sport. She expands her expectations looking forward to upcoming events, though his seeming lack of interest dampens her ardor a bit. Despite her hopeful view, however, it turns out that her passion for Mikio only ends up arousing the sexual desire of a man that appears unexpectedly... 
(Source: AniDB)

Based on the erotic game Shin Hitou Meguri by Potage. 
 
Telling a Beautiful Girl's nephew from the innkeeper's home. Where the Beautiful Girl is very close to his own uncle who served as Security at the inn. One day, this beautiful girl had sex with her uncle in the inn room. 
 
(Source: Nekopoi and Has Been Translated)

Mikio returns to his hometown for the first time in half a year. The first thing he sees is the traditional Japanese onsen inn managed by Yukino Chitose, childhood friend and one-time lover. 
Despite the passing of half a year, Chitose still possessed a girlish appearance. However, the traditional clothes that she wears brings out a mature and beautiful feel about her. 
That night, upon conclusion of his business, he goes in search of Chitose. Hearing her voice, he follows it and comes to an outdoor bath. Peeking through a gap in the bamboo fence, he is stunned to see her with another man...

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