 If you liked
Namanaka.
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 ...then you might like
Aibuka! (Kari)
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Hentai about guys who gather harems for a certain purpose (keeping a club alive and helping a spirit return to the past). Each has one girl that is really the main girl but in the end the guy ends up having sex with all of them together.
Namanaka is a bit heavier on fetishes and female archetypes, but neither is vanilla.