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Both series feature a love triangle with (what appears to be) multiple instances of the same girl. Ashita Dorobou is considerably better than Arisa², but if you're looking for this particular theme you might want give both a try.
Yuuhi Amamiya is a loner whose mistrust of people was instilled in him at a young age by his abusive grandfather. So when an annoying talking lizard tells the university student that he is one of twelve knights chosen to stop the gigantic "biscuit hammer" before it smashes the Earth to smithereens, Yuuhi has no inclination to rescue such an unkind world. Despite his apathy, the boy is targeted by a golem while going about his day-to-day life, and ends up teaming up with the other knights anyway. One of his new companions is Samidare Asahina, the "princess" and leader of the knights, who secretly is only trying to protect the Earth so she can destroy it herself! Entranced, Yuuhi swears eternal loyalty to this cheerful devil that promises to crush the world he despises.
Both Hoshi no Samidare and Ashita Dorobou feature everyday life of the male lead taking a turn for the weird. In both cases this involves an extraordinary girl who has plans to change the world and a huge object floating above earth. If you liked one of those two series the other one should prove interesting too.
P.S. This may sound like the plot of a generic series, but those two are far from being generic.
In both manga a guy is in a love triangle with two instances of the same girl (in Kirara one is older and the other is the same age as him and in Ashita Dorobou one is younger while the other is the same age as the guy).
Kono Kanojo wa Fiction desu and Ashita Dorobou are very similar series. In both of them an "ideal" girlfriend (one based on male leads imagination, though in Ashita Dorobou she also had a living model) appears out of nowhere (more like comes into existence). The girl is however more to handle than the male lead would ever imagine, since she fires laser beams from her eyes when she is angry and she is quite possessive (if only all yandere were this adorable). Also, both series feature a love triangle. If you liked one of those two series you just have to read the other one too.
P.S. Those series are not as generic as their descriptions may sound.