Yup, if there's a girl you don't like, you need to choose the non-harem route which will be given in the next chapter.
Yea I read your comment further down about Risa after I asked and I am going to see how that plays out first. It'd be one thing if it were an established boyfriend, a quiet, unrequited love on Ren's part, or something along those lines but that it boiled to two suitors and she chose the other leaves a bit of a bad taste. Then they end up together only after her first choice turns out to be a dick, even given time, that's personally off-putting, and juxtaposed against not only a heroine like Natsumi but a relationship like Ren and Natsumi's, Risa and everything she entails sounds worse by comparison. Compounded by some of her other actions, well, she's rough. Generally I'd leave this alone but a) it is a dating sim and b) she is ostensibly unavoidable if you're interested in anyone other than Natsumi. Still I'm interested in the "why" of things on her part. Thanks for the response.