 If you liked
Island
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 ...then you might like
Kono Yo no Hate de Koi wo Utau Shoujo YU-NO
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Both are based on highly rated visual novels where the protagonist suddenly gets dragged in many mysteries while surrounded by beautiful women. Furthermore these anime are very similar because of time travel (explaining more would be spoilers)
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Recommended by BerrakBurcu
Very similar shows where mystery surround characters and seems impossible to find the truth. Also the protagonist is a very sensitive person who knows how to obtain information of cute girls.