Legend has it that the top of each crane's head is originally white. Only when they fall deeply in love with someone will the top of their head gradually become red. For the sake of the one you love, you are willing to leave your own tribe and stay in the so-called human world, just to spend your whole life with the one you love. Therefore, all people see are red-crowned cranes, and the red on their heads is a symbol of love.
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Cp crane first issue, pay attention to the OOC character, pay attention to the bird version of Tsurumaru! Poor writing, useless plot