シーナ

The main heroine and the girl who is chained to Joe. Just like Joe, she has just lost her memory. A girl who wears punk-rock style clothing, she suffers from multiple personality disorder and isn't aware of these four different personalities; however, her other personalities are aware of themselves and are even shown to share the same memories. It's later revealed that Shiina also possesses Yumiko's, Genji's dead wife's and Joe's mother's memories. They were transferred into her after Genji wished to see her again, and because Shiina was very similar to her. This all happened when Joe and she were children. This personality, which is different from the other personalities, is called "Rosea". In a bad ending, it's revealed that Rosea is a yandere: she started screaming at Genji for "flirting" with other women, and was willing to kill herself after realizing she had killed him, not to mention she wants to be with him forever, repeating how she will love Genji forever. In the same ending, she completely takes over Shiina's body and refuses to peacefully pass on. In the true ending, the "real" Shiina, or in other words, Joe's real childhood friend, manages to survive while Rosea peacefully passes on together with Genji, with the other personalities being gone as well.