Homestay-chu no Doitsu Musume ga Issho ni Furo ni Haitte Kuru Wake

"A German girl would even go as far as doing that while taking a bath with me!?"

Shuu found himself hosting a visitor for a homestay, as a request from his parents who have been assigned to work in Germany. And so, a beautiful exchange student named "Mia" arrives at his house.

"Living under one roof with a German girl who's got an attractive face and figure..."
The unexpected meeting made his heart race, but what awaited the two of them them was a lifestyle of living together filled with difficulty in communication, including their cultural differences. Shuu is running around in circles unable to understand Mia's behavior, and that leaves him with no time to rest.

On one such day, the tired Shuu is taking a bath when she comes over and says "Have you washed your body? ...sit over here. I'll help you."
For some reason, appearing now before him was the figure of Mia standing right there, with her captivating body exposed. Shaken by this sudden turn of events, he is unable to turn down her offer and winds up getting her to help him wash his body, from his shoulder down to his back, from his back to his chest, from his chest, down to his waist...

Her behavior gradually starts escalating...

This is a flirty love manga about things like getting your body carefully washed in the bath by a beautiful German girl, and having lovey-dovey sex with her.

(Source: Melonbooks, translated)