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In the close-knit Arisuno housing complex, siblings Azuki and Daizu have grown up alongside their charming and popular neighbor, Chika Tachibana, forming a bond strengthened by their busy parents' absence. Their lives shift when the aloof Mizuki and his rebellious younger brother, Ryuusei, move in next door, bringing new dynamics and challenges. As Azuki navigates her feelings and the evolving relationships around her, the group learns the value of support, understanding, and the ties that bind them together.