Sana Kuranaka

Airi's best friend since childhood. Her favorite hobby is filming Airi, regardless of what the latter is doing. She agrees to have sex with Kouzou in return for the privilege of shooting videos of Airi having sex with him.Tropes exhibited by this character include:Insult to Rocks: In the OVA version of events, she complains that Masato left her unsatisfied and begged Kouzou for sex.Lovable Sex Maniac: YMMV on "loveable" but she's a sex maniac who both loves filming Airi having sex with Kouzou and having sex with him herself.Obliviously Evil: She seemingly can not comprehend why Airi is so opposed to being drugged into having sex with Kouzou and then being filmed in the act, regardless of Airi's protests.Schmuck Bait: In the OVA, she lets herself be tied up in a public bathroom by Airi and sets up a camera to film herself. Masato, rather than free her when he chances on the scene and she asks for help, decides to have sex with her instead. He's enraged when he sees Marina watching the video of his criminal acts and tries to retaliate by engaging in felonious stalking and blackmailing the Akitsuki family with photos of Marina and Kouzou visiting a Love Hotel. Kouzou torpedoes him by showing how the incriminating photos can be easily faked (since Masato used the school's A-V room to edit and publish the photos), and Masato winds up destroying himself when he comes after Kayoko with a box-cutter as she was entering a school provided meeting room for an official meeting with him.Sex for Services: She agrees to unrestricted sex with Kouzou in return for unrestricted filming of Airi having sex with him.Three-Way Sex: Her favorite way to film Airi having sex with Kouzou is to join in the sexy-fun times while the camera is rolling