[Equip] Coincaller (Event) - After saving the Village girl NPC with Kinu in Scarab Village (Story event), talk to her to obtain it.
[Ero Item] Bugjar (Hidden) - From Silent Hill, head deep into the Endless Cave Part 2 (with waterfall), keep taking the leftmost branch paths and you will come across a dead end with a stone jutting out of the ground. Examine the stone to obtain it.
[Equip] Concealed Bamboo Blade (Quest/Event) - Get infected with Nose Bug infection from the enemies, Joroukou found at Silent Hill. Teleport to Plume Village (you should see a purple "!" indicator on the map) and head into the rightmost house to trigger an event with a Villager NPC. Craft a Star Remedy to cure him. After curing him, leave Plume Village completely and come back into the same house. Use the Nose Bug infection to sniff out the yellow dust in place of the Villager NPC to obtain it.
[Equip] Chalcedony Magatama (Shop) - Buy it 960 Mon from a Boy in the rightmost house of Rokakku Road main street.
[Equip] Iron Gauntlet (Shop) - Buy it 1344 Mon from a Boy in the rightmost house of Rokakku Road main street.
[Equip] Steel Gauntlet (Hidden) - With the Nose Bug infection, head to the rightmost house in Compost Village. Examine the straw hat to obtain it.
[Key Item/Wrapping] Book of Introspection (Hidden) - With the Nose Bug infection, move to Rokakku Road back street. Head to the rightmost part of the town to see some yellow dust and examine it.
[Equip] Malachite Magatama (Hidden) - After saving Tusk, teleport back to the Hidden Silver Mine (teleporting here will lead you to the end of Hidden Silver Mine Part 2). Either backtrack to the beginning of Part 2 or 'Save' and 'Load' to start at the beginning of Part 2. From the start of Part 2, head right and come across a Sorcerer (humanoid enemy) with 2x Karamikase (hypnosis rope enemy). Stop here on the platform, defeat them and double jump up + uppercut attack up to a higher elevation, there will be a ledge where Hachina can stand on. Upon climbing higher there will be 3 enemies. Do not defeat all the enemies here. Lure one of them high enough to jump/hop on top of (using the jump/hop skill from Endless Cave; aka the jump/hop to defeat the Demo boss) + double jump + uppercut attack. After making it to the top, continously jump and head to the rightmost section of the cavern where your screen will be less visible from foreground obstructions. Examine the collapsed building for it.
[Equip] Orb of Night Vision (Hidden) - Climb the Oni Mountain until you meet the Jizo statue (Retrieve cloth statue). Keep heading right of the Jizo Statue and take the bottom route. You will eventually meet a land full of Seven Arms enemies and past them, examine the cask to obtain it.
[Ero Item] Ritual Garb - Collar of Wavering (Event) - Get infected with Collar of Wavering from the enemies, Wagon Wheel at Oni Mountain. Teleport to Rokakku Road back street (indicated with "!") and head into the house all the way right dead end. There will be a Shopkeeper that will remove your Collar of Wavering. Complete the event to obtain Ritual Garb - Collar of Wavering Ero Item.
[Ero Item] Ritual Garb - Strange Robe (Event) - Same as above, but get infected with Strange Robe from the enemies, Sorcerer at Hidden Silver Mine. Teleport to Rokakku Road back street (indicated with "!") and head into the house all the way right dead end. There will be a Shopkeeper that will remove your Strange Robe. Complete the event to obtain Ritual Garb - Strange Robe Ero Item.
[Ero Item] Bell of Erosion (Event) - Head to Rokakku Road back street with Hypnosis. Go into the first available house and trigger a Hynposis event with a Shopkeeper. Craft a Daybreak Sand to free yourself of Hypnosis. After the event, leave Rokakku Road and comeback into the same house. Examine the antiquated ritual tools laying around for Bell of Erosion.
[Equip] Seal of Purity (Shop) - Head to Rokakku Prison in Rakkaku Road. Talk to ??? (Sorcerer) to buy it from him.
[Key Item/Wrapping] Book of Masochism (Hidden) - Get infected with Nose Bug then head to the Endless Cave Breezy Tunnel. While clearing the Breezy Tunnel, when presented with a split path of going up or right, head right into a dead to find some casks to examine.
[Key Item/Wrapping] Book of Disaster (Shop) - Buy it from a Merchant all the way to the right at Rokakku Road main street for 400 Mon.
**[Ultimate Medicine] Rokushinmaru (Event) - Cure every NPC with all the available medicine in the game (Parasite, Magic Leak, Oni Mother Bug, etc.) scattered across the world. All of the quest will be indicated with a purple on the map "!". When every NPC in the game is cured, you will see a white "!" at Nameless Road. Head to the tree shelter in the beginning of the game and head left + double jump + uppercut attack to a transition into Mountain Hideout. Head into the house and talk to Tusk. She will give you the ultimate recipe that can cure everything (except Magic Leak, Strange Robe and Collar of Wavering.
**As a word of caution on Version 1.1, do not save anywhere in Mountain Hideout. Loading a save in Mountain Hideout will cause the game to blackout/freeze the game.