A fusion of manga and anime characters, plus some kind of crossover-dimension group, with characters from anime and live-action works inside. Something much like what those authors on that site write: each time you level up, a new feature unlocks and two to five people are randomly invited into the group.
It's a pity, but I come here because I love you so much
I found this novel by accident, but I really like it (??ω?)? Hey