This is a very taboo story about incest and love between twins. Yori`s attitude has changed. He and his younger sister, Iku, used to be inseparable as children, but lately Yori`s been different -- eager to be apart from Iku. Iku worries that he hates her, but the truth is far more scandalous. Now, Yori would risk losing everything to have his little sister. Iku loves her big brother enough that she would never risk losing him, and so she`ll do what it takes to keep them together... but Yori doesn`t want to have her that way -- as a sister dedicated to her sibling. Can Iku ever love Yori not as a brother but as a man?
] The older twin brother who is in love with his twin sister Iku. Yori used to be a very carefree character before he realised his feelings for Iku that were unnatural. His attitude suddenly changes and Iku is left in the dark, the reason being that he is in love with her and wants to be her lover and give her the life of a normal couple. In the live action movie Yori is played by actor: Jun Matsumoto.
The younger female twin is a very heartfelt and genuine character that loves her brother as her brother. She realises that her brother has feelings for her that are more than the normal brotherly and sisterly love. In the live action movie Iku is played by actor: Nana Eikura.
Is the best friend of Yori and is always by his side. Even though Yori doesn't realise it, Haruka knows his feelings for his sister and thought that it was better for Yori to tell him by himself.And as the chapters progress, he develops feelings for Iku, and lets Yori know about it. In the live action movie Haruka is played by Yûta Hiraoka.
Is in love with Yori. She expresses her feelings toward him early in the movie and Yori tries to love Tomoka. This was all in vain because the only reason for what Yori and Tomoka shared was so Yori could forget about his true love - Iku. In the live action movie Tomoka is played by: Ayaka Komatsu