Im guessing Sakura already found the body before she was killed. which would explain the lack of witnesses. Tyler, Kiyotaka, Satomi, and Sarah were seen in teasers so theyre safe. Madison and Yoki were immune. Jeanine, and Miyuki were initial witnesses, and Kaylie was absent for most of the episode. So that just leaves Takarou and Sotaka.
Drew said that this chapter will be very emotional. A family feud ending could be sad, but so is a girl losing her crush. So im gonna say Takarou is the killer
Im sure that Sakura found Sebastians body before she was killed because of the green cloth and the fact that her sleeves were shorter. Though I believe Sotaka killed Sakura, it doesnt explain why he would kill Sebastian. Though I still think he is the killer
The 11 possible culprits are Tyler, Kiyotaka, Satomi. Sarah, Yoki, Maison, Takarou, Sotaka, Miyuki, Kaylie, and Jeanine.
Sarah, Kiyotaka, Tyler, and Satomi were all seen in teasers so that leaves 7 people; Yoki, Madison, Takarou, Sotaka, Kaylie, Miyuki, and Jeanine.
Yoki and Madison were given immunity last round so that leaves 5; Takarou, Sotaka, Miyuki, Kaylie, and Jeanine
Drew said Takarou was clean so that leaves 4; Sotaka, Miyuki, Kaylie, and Jeanine
Jeanine and Miyuki were two of the original witnesses to Sebastians death so that leaves 2; Sotaka and Kaylie
And since they said there might be two culprits, I believe Kaylie killed Sebastian because she couldnt stand living without Chisaka, And Sotaka killed Sakura to "protect" his sister