Protip: L+R+Select+Start works as standard for FPDCs -- it resets the game to the main menu. Useful if you've saved before a boss fight and are trying to get a good drop.
Apparently this is the ... second... boss drop table of the game ("Library vs Discipline Committees" -- shouldn't that be 'Discipline Committee?' There's only one group, three members though.):
種別 アイテム名
装備品 あぶない下着、あぶないパンツ、ブルマ
基本素材 折れたアックス、砕けたトマホーク
合成素材 神秘の貝殻、丈夫な皮、硬い皮、神秘の皮、中骨、大骨、神秘の布、究極の布、鉄、合金、超合金、銀の粉、銀、金の粉、金、白金の粉
特殊素材 光の粉、光の石、銀の皿、獣骨、獣の血、乙女の血、精霊石、神の裁き、神の誓い、白虎の爪、恐竜王者の爪、獣王の牙
その他 フレンチトースト、ハニートースト、ホットケーキ、クレープ、三色団子、ドックフード、古代の銅貨、古代の銀貨、古代の金貨、魔力の銅貨、魔力の銀貨、魔力の金貨、聖水
3 special armors, each one... a type of hot pants / short shorts / etc. Including bloomers. Oh, Japan.
Two broken weapons for synthing. An absolute ton of possible synth items, most of which (Platinum Powder, Gold, etc) are special.
Here's the first boss's drop table, for comparison:
種別 アイテム名
基本素材 壊れたパチンコ、折れたレイピア、変装キット
合成素材 中骨、大骨、金の粉、金
特殊素材 獣の血、獣骨、サソリのしっぽ、コブラの毒、恐竜王者の爪、乙女の血、酸性の雫
その他 魔力の銀貨、魔力の金貨
3 broken items -- a... Broken pinball machine, a "Rapier A" (not sure if the A is a mistake of the machine translation), and a "Disguise Kit." Apparently the kit is used to synth a weapon or a special stone or something.
The third boss drops the map that works on all dungeons. Getting it from him is important because... it doesn't appear till much later otherwise?
7th's boss drops a specific item that makes ... one of the strongest katanas in the game (and the strongest you can make via alchemy). Hm.