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Kusunoki Azuki and Daizu are close siblings who live in the Arisuno apartment complex. Their next door neighbor is Azuki's childhood friend Tachibana Chika, who has feelings for her. One day, two brothers who are close to their ages, Hiiragi Mizuki and Ryuusei, move into their other neighboring apartment. A heart throbbing neighborhood graffiti starts now! (Source: ShoujoHearts)