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There are various events and quests the player can trigger throughout the game. The events and quests are listed below by their available regions.

Heaven

UFO
Ufo
Tenshi discovers the UFO
Prerequisite: N/A
Trigger: N/A
Target: UFO
Location (trigger): Heaven
Location (target): UFO
Explanation: Defeat the UFO in the map UFO.
Unlocks: First 4 bosses (event), Scarlet Devil Mansion (map), Bamboo Forest of Wandering (map), Youkai Mountain (map), Fantastic Wind Hole (map)


Unidentified Source of Light
Needs an Image Prerequisite: Defeat Sakuya (event) and Defeat Reisen (event) and Defeat Sanae (event) and Defeat Yamame (event)
Trigger: N/A
Target: Unidentified Source of Light
Location (trigger): N/A
Location (target): Heaven
Explanation: Defeat the Unidentified Source of Light
Unlocks: Youkai Mountain treasure (event), To Eientei (event), Meet Okuu (event).


Everything Has its Own Use
Shiki
Shiki challenges Tenshi
Prerequisite: i) Defeat Remilia (event) or Defeat Kaguya (event) or Defeat Kanako (event) or Defeat Okuu (event)

ii) sell the Sword of Hisou to any shop

Trigger: Shikieiki Yamaxanadu
Target: Shikieiki Yamaxanadu
Location (trigger): Heaven
Location (target): Heaven
Explanation: Defeat Shikieiki Yamaxanadu to get the Sword of Hisou back.
Unlocks: Sword of Hisou(upgraded) (item), Stick of Enlightenment (item - obtained by chance)


Key for all Doors
Needs an Image Prerequisite: Clear at least two of the following: Defeat Remilia (event), Defeat Kaguya (event), Defeat Kanako (event), or Defeat Okuu (event)
Trigger: N/A
Target: N/A
Location (trigger): N/A
Location (target): N/A
Explanation: Obtains the key for all doors
Unlocks: Key for all doors (item)


To the Sea of Clouds
Needs an Image Prerequisite: Defeat Remilia (event) and Defeat Kaguya (event) and Defeat Kanako (event) and Defeat Okuu (event)
Trigger: Yukari Yakumo
Target: Yukari Yakumo
Location (trigger): Heaven
Location (target): Heaven
Explanation: Yukari will give you access to the Sea of Clouds
Unlocks: Defeat Yukari (event), Final Battle (event), Sea of Clouds (map)


Defeat Yukari
Yukariwins
Yukari summons Ran to fight for her
Prerequisite: To the Sea of Clouds (event)
Trigger: Yukari Yakumo
Target: Yukari Yakumo
Location (trigger): Heaven
Location (target): Heaven
Explanation: Challenge Yukari to a duel.
Unlocks: N/A


Scarlet Devil Mansion

Meet Patchouli
Needs an Image Prerequisite: N/A
Trigger: Patchouli
Target: Patchouli
Location (trigger): Scarlet Devil Mansion
Location (target): Scarlet Devil Mansion
Explanation: Meet Patchouli and ask her about the UFO.
Unlocks: Recruit Patchouli (event), Library (map), Patchouli (shop)


Recruit Patchouli
Needs an Image Prerequisite: Meet Patchouli (event)
Trigger: Patchouli
Target: Old Book (event point), Marisa Kirisame
Location (trigger): Library
Location (target): Library
Explanation: After unlocking the library, talk with Patchouli. She will request that her lost old book be found, and the player must find the event point of the old magic book.
Unlocks: Patchouli (playable character) (only if the player chooses to secure to magic book instead of give it to Marisa)


Defeat Sakuya
Needs an Image Prerequisite: UFO (event)
Trigger: Sakuya Izayoi
Target: Sakuya Izayoi
Location (trigger): Scarlet Devil Mansion
Location (target): Scarlet Devil Mansion
Explanation: The player must defeat the adamant Sakuya.
Unlocks: Unidentified source of Light (event) (need to clear other events to fully unlock the event), Key of Scarlet Devil Mansion (item), Sakuya Izayoi (playable character)


Bamboo Forest of Wandering

Help Mystia
Needs an Image Prerequisite: N/A
Trigger: Mystia Lorelei
Target: Yatsume (boss)
Location (trigger): Bamboo Forest of Wandering
Location (target): Riverside of the Bamboo Forest
Explanation: The player can decide to aid Mystia with her Lamprey situation. If the player decides to help, the player must defeat the lamprey(boss) in the Riverside of the Bamboo Forest map.
Unlocks: Mystia Lorelei (playable character) (the player is not required to clear the quest to have her join)


Defeat Reisen
Needs an Image Prerequisite: UFO (event)
Trigger: Reisen Udongein Inaba
Target: Reisen Udongein Inaba
Location (trigger): Bamboo Forest of Wandering
Location (target): Bamboo Forest of Wandering
Explanation: The player must defeat Reisen U Inaba.
Unlocks: Unidentified source of Light (event) (need to clear other events to fully unlock the event), Rabbit's Inn(map)


A Lost Boy
Needs an Image Prerequisite: N/A
Trigger: Keine Kamishirasawa
Target: Lost Boy (event point)
Location (trigger): Bamboo Forest of Wandering
Location (target): Deeper part of Bamboo Forest
Explanation: Find the Lost Boy in the Deeper part of Bamboo Forest.
Unlocks: Find Mokou (event) (need to clear another event in order to fully unlock the event)


Ask Keine
Needs an Image Prerequisite: Youkai Mountain Treasure (event)
Trigger: Keine Kamishirasawa
Target: Minamitsu Murasa
Location (trigger): Rabbit's Inn
Location (target): Palace of Earth Spirits
Explanation: Ask Keine about the treasure map of the Youkai Mountain
Unlocks: To fight or not to fight (event)


To Eientei
Needs an Image Prerequisite: Unidentified Source of Light (event)
Trigger: Tewi Inaba
Target: Tewi Inaba
Location (trigger): Rabbit's Inn
Location (target): Rabbit's Inn
Explanation: Talk to Tewi to go to Eientei.
Unlocks: Eientei(map)


Find Mokou
Needs an Image Prerequisite: A Lost Boy (event) and Unidentified Source of Light (event)
Trigger: Keine Kamishirasawa
Target: Keine Kamishirasawa
Location (trigger): Rabbit's Inn
Location (target): Rabbit's Inn
Explanation: Keine is worried about Fujiwara no Mokou.
Unlocks: Kill the Rat (event) (need to clear another event in order to fully unlock the event)


Ingredient for the Medicine
Needs an Image Prerequisite: Patchouli gets Ill (event)
Trigger: Eirin Yagokoro
Target: Medicine Ingredient (event point)
Location (trigger): Eientei
Location (target): Herb Field
Explanation: Eirin will make the medicine for Patchouli, but she wants the player to get the ingredients.
Unlocks: Kill the Rat (event) (need to clear another event in order to fully unlock the event), Reisen Udongein Inaba (playable character), Patchouli Knowledge (playable character)


Kill the Rat
Needs an Image Prerequisite: Ingredient for the Medicine (event) and Find Mokou (event)
Trigger: Eirin Yagokoro
Target: Fujiwara no Mokou
Location (trigger): Eientei
Location (target): Eientei
Explanation: Eirin thinks there is an intruder in Eientei. The player must decide whether to kill the intruder or not.
Unlocks: Fujiwara no Mokou (playable character) (only if the player decides to refuse Eirin's request)


Youkai Mountain

Defeat Sanae
Needs an Image Prerequisite: UFO (event)
Trigger: Sanae Kochiya
Target: Sanae Kochiya
Location (trigger): Youkai Mountain
Location (target): Youkai Mountain
Explanation: Defeat the adamant Sanae.
Unlocks: Unidentified source of Light (event) (need to clear other events to fully unlock the event), Kappa's Freemarket (map)


Youkai Mountain Treasure
Needs an Image Prerequisite: Unidentified Source of Light (event)
Trigger: Nitori Kawashiro
Target: Keine Kamishirasawa
Location (trigger): Kappa's Freemarket
Location (target): Rabbit's Inn
Explanation: Talk to Nitori for some information about a treasure in the Youkai Mountain.
Unlocks: Ask Keine (event)


To Moriya Shrine
Needs an Image Prerequisite: Treasure Map (item)
Trigger: Nitori Kawashiro
Target: Kanako Yasaka
Location (trigger): Kappa's Freemarket
Location (target): Moriya Shrine
Explanation: Talk to Nitori after obtaining the map for further directions.
Unlocks: Meet Kanako (event), Moriya Shrine (map)


Meet Kanako
Meetkanako
Kanako reveals the location of the treasure
Prerequisite: To Moriya Shrine (event)
Trigger: Kanako Yasaka
Target: N/A
Location (trigger): Moriya Shrine
Location (target): N/A
Explanation: Ask Kanako about where the treasure cave is.
Unlocks: Defeat Kanako (event), Deeper part of Youkai Mountain (map)


Defeat Kanako
Needs an Image Prerequisite: Meet Kanako (event)
Trigger: Kanako Yasaka
Target: Kanako Yasaka
Location (trigger): Moriya Shrine
Location (target): Moriya Shrine
Explanation: Kanako challenges you to a battle.
Unlocks: The Shield of Isis (item) (drops by chance)


Defeat Momiji
Needs an Image Prerequisite: N/A
Trigger: Inubashiri Momiji
Target: Inubashiri Momiji
Location (trigger): Deeper Part of Youkai Mountain
Location (target): Deeper Part of Youkai Mountain
Explanation: Defeat Momiji to get past to the treasure cave.
Unlocks: N/A


Defeat Suwako
Needs an Image Prerequisite: N/A
Trigger: Suwako Moriya
Target: Suwako Moriya
Location (trigger): Deeper Part of Youkai Mountain
Location (target): Deeper Part of Youkai Mountain
Explanation: Suwako challenges you to a battle.
Unlocks: N/A


Broken Doll
Needs an Image Prerequisite: i) Hina Kagiyama must be in your party, ii) Clear at least two of the following: Defeat Remilia (event), Defeat Kaguya (event), Defeat Kanako (event), or Defeat Okuu (event)
Trigger: Hina Kagiyama
Target: Alice Margatroid
Location (trigger): Youkai Mountain
Location (target): Forest of Magic
Explanation: Hina finds a doll in Youkai Mountain that can be repaired for use.
Unlocks: Repairing the Doll (event), Forest of Magic (map)


Fantastic Wind Hole

To Fight or not to Fight
Needs an Image Prerequisite: Ask Keine (event)
Trigger: Minamitsu Murasa
Target: Minamitsu Murasa
Location (trigger): Palace of Earth Spirits
Location (target): Palace of Earth Spirits
Explanation: The player must ask Murasa to give up the treasure map, then decide whether to bribe her or to fight her.
Unlocks: Treasure map (item), To Moriya Shrine (event), Meet Byakuren (event - only if the player decides to bribe Murasa)


Meet Byakuren
Needs an Image Prerequisite: To Fight or not to Fight
Trigger: Byakuren Hijiri
Target: Byakuren Hijiri
Location (trigger): Palace of Earth Spirits
Location (target): Palace of Earth Spirits
Explanation: The player must persuade Byakuren to join the party.
Unlocks: Byakuren Hijiri (playable character)


Other Regions

Patchouli Gets Ill
Needs an Image Prerequisite: Defeat Remilia (event) or Defeat Kaguya (event) or Defeat Kanako (event) or Defeat Okuu (event)
Trigger: N/A
Target: N/A
Location (trigger): N/A
Location (target): N/A
Explanation: Patchouli gets sick and she will no longer be available as a playable character until you clear the next event.
Unlocks: Ingredient for the Medicine (event)


Final Battle
Nuechallenge
Nue challenges Tenshi
Prerequisite: To the Sea of Clouds (event)
Trigger: Nue Houjuu
Target: Nue Houjuu
Location (trigger): Sea of Clouds
Location (target): Sea of Clouds
Explanation: Final Battle: Defeat Nue!
Unlocks: Ending



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