They will probably have two chapters for a sleepover to strategize what this means, then Ichiji will push Amane to go talk to Seo since she already made things awkward and then Amane will actually talk to Seo and Ichiji will show up and then it gets resolved back to our current status quo with no progress and the manga continues as is...is my guess. I haven't checked the raws.
I'm keeping my fingers crossed.
Now for the ending, as others mentioned so far during the series it has always been mentioned the three are the happiest when they are all together, and that would support an harem ending with Otaku kun dating both girl. But I can also see the possibility that jne if them becomes his girlfriend and the other stays as his platonic best friend, similar to what happened in
. In that case, I think Ijichi has the advantage since it would be easier to keep Anane around as an otaku partner.
I obviously don't even want to think of the possibility we'll get an open ending with no romantic resolution, but I'd accept separate routes.