Eita Akutsu is a loner and an introverted mecha otaku. One night, the cheerful and popular gyaru, Makina Agatsuma, suddenly appears in his apartment. But something seems off about her. When she abruptly strips in front of him… what he sees is not a human body, but a mechanical one! Makina is an AI robot designed for intimacy, yet she's been restricted from accessing any adult-related information. Eita, on the other hand, is a pure-hearted virgin who is extremely awkward with anything lewd. Thus begins their top-secret cohabitation, where no one must find out her true nature!

[Source: OceanVeil]

The story centers around Yoshizou Yukawa, a major hot spring fan who finds hidden springs to revitalize the economy of the local area. However, he dies after falling off a cliff and is transported to an alternate world, thanks to an inari deity of harvest at a small shrine nestled in the rocks. Together with the inari's attendant princess Mayudama, he continues searching for storied hot springs, only this time in the alternate world. Along the way, he ends up naked in hot springs with furry-eared girls and elven girls.

[Source: Anime News Network]