Hm, as a finale is a bit weak. I feel it needed more action and less dialogue, Yumemi also has a weird personality switch that is kinda unearned and also doesn't stick around as she reverts back to normal-ish. The outfit change was totally unnecessary too, it just doesn't fit and feels fanservice-y. The epilogue leaves some things open for the possibility of a continuation but the important parts are closed satisfactorily.