Considering that several of the main characters supposedly have the memories of gods from mythologies where mass polygamy (and having side-chicks or side-dudes) was common and the story explicitly pointed that out early on and makes jokes about it in the omakes, you'd think someone would come up with the idea of "hey, we don't need to fuck around with this love triangle/quadrangle/n-gon Japanese teenager pussyfooting bullshit, let's just all get together. We can share".
For crying out loud, Suseri has memories of being his former incarnation's main wife while he built a harem! You'd think she might use those memories to suggest to Ise and Kamika (and possibly the lesbian valkyrie) that, you know, there might be an easier solution to this whole situation than moping around biting fingernails about it.
Also, the author just casually ignored the fact that the MC's childhood friend has memories of their past selves screwing, and this kind of awkwardness that probably would have caused between them after she awakened. But not, she's just been casually interacting with him this whole time, even going to sleep in his room like nothing's happened.
It's a fun concept (and I've alway loved Segawa Hajime's art), but the standard awkward Japanese teenager love triangle angle just really doesn't play well with the premise. It's a bad case of an author trying to have their cake and eat it too, although we did get some funny Amaterasu In The Cave jokes out of it.