 If you liked
AIKa R-16: Virgin Mission
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 ...then you might like
Asobi ni Iku yo!
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They share the same comedy + ecchi based story style
Both have some missions and the actions are mainly performed by young female.
Asobi ni Iku yo is more random. It is bundled with UFO & catgirl aliens, with a protagonist and a harem; while Aika is female centered with a secret mission to complete per series...