Soul Mate

Mairi (Mattia x Kairi)
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In a world where you know you have your soul mate when you both develop the same tattoo. Some people find their soul mates when their young and others find them when their older. So what happens when a young man falls in love with his best friend, even though he knows he can't be with him? Somebody may get hurt? Somebody may cry? Somebody may even die?
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You're gonna have to read and find out. :)