Nao Takanashi loves her brother Shūsuke despite the incest taboo. Nao thinks that Shūsuke is her blood relative, but in fact she is an adopted daughter, whose parents already died. After Nao learns the fact, she wants to normally fall in love with Shūsuke because siblings by adoption can marry under the family law in Japan, but his old girl friend Iroha Tsuchiura obstructs Nao’s wish, claiming to him that Nao is his sister even if she is an adopted child.
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