Well if you want to update the game files to add this English version of the 攻略情報ネタバレ注意.txt I’m sure it could help people!
Warning! Obviously massive spoilers.
Item and Defeat Events guide.txt
[spoiler]Big spoilers for whenever you want to know where any hidden item, equipment, or defeat scene is and how to get them.
ALL HIDDEN ITEM AND DEFEAT EVENTS:
[Where to get special tools]
・Bug Jar___ Can re-apply treated Bug-type aliments.
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Lower left of the second map of Endless Tunnel where the waterfall is located.
Obtained by searching the raised platform in the small room that passes through the passageway filled with blue flesh lumps.
・Bell of Erosion__ Hypnosis aliment can be re-applied at any time.
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Back street of Rokkaku Road, the building on the far left.
After talking to the shopkeeper with a Hypnosis aliment and viewing the event, once you exit Rokkaku Road, enter the same store again.
・Ritual Garb__ You can put on and take off the Strange Robe and Collar of Wavering at any time.
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Back street of Rokkaku Road, building on the far right.
Obtained after entering the store in the Strange Robe or Collar of Wavering and viewing the event.
[Where to get equipment]
・Money calling bell ____ Dropped money will be pulled towards you
Obtained by talking to the village girl who was treated for the Voice Bug in Scarab Village.
・Chalcedony Magatama ____ +1 Attack
Purchased at the third generation water jug store on the right end of Rokkaku Road.
・Malachite magatama ____ +3 Attack
Hidden Silver Mind. Straight up on the left side in the first room of the second map.
Follow that path to the end to find the item at a destroyed house.
You can either guide an enemy to jump on or use an upward jump-slash to each the upper platform.
・Iron gauntlets ____ Reduces Damage by 20%
Purchased at the third generation water jug store on the right end of Rokkaku Road.
・Steel gauntlets ____ Reduces Damage by 40%
Found in the building on the far right of Compost Village in a stinky state.
・Seal of Purity ____ Improves resisting power for escaping capture
Purchased from the Merchant Magician in Rokkaku Prison after the battle with Kinu.
・Concealed Bamboo Blade ____ +1 Attack per hit up to +12
Building to the far right in Plume Village.
After viewing the Nose Bug treatment event and upon leaving Plume village then re-entering the same building It can be found under a tatami mat if afflicted with Nose Bug.
・Orb of Night Vision ____ See ghosts without light
Bottom right of the cave to the right of Oni Mountain.
Obtained in the small shrine at the end of the bottom path
[Special Items]
・Book of Disaster ____ Lets you fight bosses that has already been defeated
Rokkaku Road at the far right.
Buy the book from the merchant outside the store.
・Book of Introspection ____ Allows viewing detailed status
Back street of Rokaku Road.
At the very back you can find the item in a basket if afflicted with Nose Bug.
・Book of Masochism ____ Uncaps development
In Breezy tunnel, When you get to a room with two Joroukou and a tunnel to the right with two Suitsukigashira; go into it.
At the end of this tunnel it can be found in a basket if afflicted with Nose Bug.
・Hidden Medicine Recipe: Rokushimaru ____ Clears all status aliments
To the far left on Nameless Road double-jump then jump slash up the left wall.
In the next area enter the house and talk to Tusk for the recipe if you have cleared every type of aliment.
[Special defeat event occurrence conditions]
・Futan Douji Battle
Eat suspicious mushrooms at least 4 times in Endless Cave and enter the boss room.
・Kirikinu Life Battle
Refuses Dharma Eye Medicine and enters Rokkaku Prison.
・Sumibuchi match
Enter the boss room in the Strange Robe state.
・Kuyo match
Enter the boss room with the Orb of Night Vision equipped.
(as found in the 攻略情報ネタバレ注意.txt file that comes with the game, written by the dev and TL’d by Google. Then edited to match in-game names of locations and items. Also added 4 new items and descriptions for what they all do. Finally I edited the text so it makes more sense in English.)[/spoiler]