 If you liked
Monster Collection: Majuu Tsukai no Shoujo
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 ...then you might like
Shisen no Shoukanshi
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Both titles have a summoner who commands various creatures and many of them look like extremely hot women including a Lamia on both titles.
Both titles also have that classic JRPG vibe going for them however Monster Collection is much darker and more serious compared to Deadline Summoner