@voidox: You're not wrong as that's what's going on at a base level, but if you think about it in a different way (or overthink it, more like), a few of the girls low-key want him. Chief is definitely thirsty for him since Chapter 1
and was definitely aggressive about it in the remote island
, Raika can be considered a possibility, as well as Eru and Kuro.
Erufuda and Raika live with the MC so one could argue something's going on there.
The satyr is a stretch, but it's still there. One could argue the Alraune wants him
especially when it's implied she reverse-raped him that time she was drunk on coffee. The rumor is being drunk releases all inhibitions and let's your inner thoughts out
Everyone else? Not so much. Gotta remember a harem is not all or nothing, it can even just be between two girls and that'll still get the tag rolling. Despite everything I wrote, though, I also feel a harem tag is a bit inaccurate this time. A large female cast and one male character doesn't always attribute to a harem.