It’s a manga, a lot of it is pretty cliche (dungeons in the real world, players… common if you read that kind of thing), but two things are different:
One, the players get wings, with angel wings being the most common. (except MC, who gets a tail)
And Two… the MC saves a dying player at the start, and she’s loopholed into being a ‘supporter’ instead of dying… AKA Navi. And when she successfully becomes one? She shrinks.
It’s pretty cute; the manga is actually aware of the realities of being small (she struggles to manage an energy bar, and the MC imagines her being trapped under one), and she’s actually an adult, which is always nice.
Sadly, while there’s a low key romantic build up happening, she’s supposed to be able to grow as she advances, so by the time actual romance starts she’ll probably be normal size… though, on the other other hand, by the later chapter I just checked, as well as the cover, she’s still small, so she’ll probably be small long term!