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As twin sisters who unexpectedly came to the Nohara family, Feixu and Xiaoxin grew up together in Futaba Kindergarten. She is not as outlandish and funny as Xiaoxin, but she has delicate observation and gentle heart. In her daily life in Kasukabe, she will help Xiaoxin clean up the mess, act as a "buffer zone" when Meiya gets angry, and will also have the courage to stand up when Xiaoai is bullied. When the adventures of the Kasuga Defense Team, the kindergarten sports meeting, and the trivial daily life of the family are intertwined, Feixo's emotions slowly sprout in the warm light of the Nohara family.