Homelander

A young man who lost his family early gets pulled out of an ordinary life the moment he saves a stranger's life, and her real identity turns out to be anything but ordinary. From there the story leans into fantasy-adventure territory rather than played for laughs.

He ends up drawn into her world, meeting people from various races across a setting he doesn't fully understand yet, while piecing together secrets about his own past. Along the way he starts building something like a family again, growing closer to the women around him and slowly training magical abilities he'll need to protect his homeland.

As a visual novel, progress comes from reading through these encounters and choices, watching relationships develop with the people he meets rather than any combat or resource system. The game is upfront about one thing: no NTR, full stop.