How to melt enemies:
Step 1:
Get "L's Letter of Challenge" from beating the phantom thief challenge mode.
Equip "Deguchi Hosonaru" (buy from upper town shop) with it.
You are now wielding a tight spread shotgun that goes pretty far.
Step 2:
Get "Star Shot" from beating the superstars challenge mode.
Equip "Deguchi Hosonaru" with it on right hand.
Step 3:
Get "Lynx's Wind" from beating "Latier Revenge"
Equip "Deguchi Hosonaru" with it on left hand. When Grandpa gives you "Deguchi Hosometano", put that on instead so the projectiles go farther.
You can now obliterate succubi health bars with your 3 far-reaching tight-spread shotguns.
Also, goddamn this game was so short.