The culprit is Kinji Ogawara. Naoto Kishitani indirectly cause Ryoichiro's death. After the case, Rum detects Rumi and plans to have Chianti and Korn eliminate her.
In the flashback, Haneda headed to Amanda's room, and the true name of Asaka was Rachel Asaka.Haneda also pointed out that the disease of her eye is Amaurosis Fugax.