Some anime belongs to a story-wise unrelated set. One example I have in mind is the 1985 anime Shoukoujo Sara, a 46-episodes series which belongs to the "set" World Masterpiece Theater.
Though similar to it is not really the same as the existing "relations". Thus, a "belongs to group/set/collection" field would be welcome for these titles.
Also, speaking of relations, even though the relations function already exists a "belongs to group" field would still be very convenient in addition.
"Belongs to group" field [tracked]
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