 If you liked
Bleach
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 ...then you might like
Campione! Matsurowanu Kamigami to Kamigoroshi no Maou
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Both series feature some epic sword fights, monsters from another realm that normal people cannot see and a main character who gets thrown into this situation without hardly any warning. Bleach is much longer than Campione and has a lot of filler episodes. But if you liked one of these series you will enjoy the other one too.