Damn this is good. I do think the story would be completely fine ending here, but it seems it's going to include the other girl. Maybe a Harem, however since it ended with both confessing their feelings to each other, the inclusion of another girl in this is a bit difficult. Would love if he did a consensual harem though.
I would love a sequel, but it looks like the MC story is complete, the new girl is interesting, she could have her own chapter with someone else, or a prequel. I mean a threesome would be nice too, if it is only the otaku and the new girls then that would be cheating..