Yn ln a friend of minato but Yn is a powerful person as Yn learns about Minaka game using these women called sekirei to fight each other who ever wins gets the prize Yn see it as evil to fight over a prize that we don't know what it is so Yn wants to stop minaka and hopefully have the sekirei go free and not to worry about being killed

Yn harem
Akitsu
Hibiki
Hikari
Kazehana
Kocho
Taki
Tsukiumi
Ichiya

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Season 1

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Season 2