A compiled list of the current students, grades, and weapons of choice!

Akemi - Third Year HS - None
Midori - First Year HS - Box Cutter
Kaminari - Third Year HS - Batons and Katanas
Sachiko - Second Year HS - ??? (Scissors?)
Rui - Second Year HS - Short Blades?
Ayano - Third Year HS - Throwables
Kato - Third Year HS - Metal Pipes and Sledgehammers
Noboru - Second Year HS - Fisticuffs
Seth - Graduate? - Gauntlets
Shiki - Fourth or Fifth Year ES - Soccer Ball
Sato - Third Year HS - Bows
Chiaki - First Year HS - Whips

Edit: I have a feeling that its going to involve murder of her loved one or other people, and suicide.