 If you liked
Absolute Duo
|
 ...then you might like
Valkyrie Drive: Mermaid
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Both are ecchis revolving around going to a place to learn how to fight where only a selected few are welcomed. The biggest differences though is that Absolute Duo is a Harem and Valkyrie Drive: Mermaid is a Shoujo Ai
Both have ecchi parts and weapons based on the personality of the user.
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Recommended by Sparrow112