The film tells the story of 19-year-old Kurosawa / Nana (Akiyue Sanjia) living in a corner of Tokyo. She only trusts two people in the world, one is her biological mother, and the other is her favorite girl of the same age, Marin (Endo Shincai). In the youth that longed for love most, Nana met them, but the cruel world deprived her of the right to love. With the continuous presentation of Marin life, Nana fell into endless struggle and pain, and began to find the true meaning of love.
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