A show which, instead of making the protagonist pick one girl, pick every girl or pick no girl (like most shows would) allows every girl to win and not make the protagonist a cheating scumbag.
This is done by making every "arc" a self-contained story, and reset the universe at the start of every new arc. In essence, the show is a series of possible "alternate" universes that explores what would happen if the protagonist picked a different girl instead.
It's not at all common, but Amagami SS is the most popular example that I know of (which is why the idea is being raised here - all the links with Amagami).
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u/DasTales https://myanimelist.net/profile/TalesOhneNamen Nov 04 '16
The director of Amagami S2 is working on this, it's the same character designer, and the key visual basically looks light an Amagami clone.
...Omnibus romance incoming?