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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.

Overall

First 4 Bosses
Needs an Image Prerequisite: UFO (event)
Trigger: N/A
Target: Sakuya Izayoi, Reisen Udongein Inaba, Sanae Kochiya, Yamame Kurodani
Location (trigger): N/A
Location (target): Scarlet Devil Mansion, Bamboo Forest of Wandering, Youkai Mountain, Fantastic Wind Hole
Explanation: Defeat all first four bosses to progress to the next series of maps.
Unlocks: Unidentified Source of Light (event)


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: First 4 bosses (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: Beat at least one of the second 4 bosses, 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)


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: 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): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
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): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
Explanation: The player must defeat Reisen U Inaba.
Unlocks: Rabbit's Inn(map)


A Lost Boy
Needs an Image Prerequisite: N/A
Trigger: Keine Kamishirasawa
Target: Lost Boy (event point)
Location (trigger): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
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): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
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): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
Explanation: Talk to Tewi to go to Eientei.
Unlocks: Eientei(map)


Youkai Mountain

Youkai Mountain Treasure
Needs an Image Prerequisite: Unidentified Source of Light (event)
Trigger: Nitori Kawashiro
Target: Keine Kamishirasawa
Location (trigger): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
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): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
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): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
Explanation: Ask Kanako about where the treasure cave is.
Unlocks: Defeat Kanako (event), Deeper part of Youkai Mountain (map)


Defeat Momiji
Needs an Image Prerequisite: Meet Kanako
Trigger: Inubashiri Momiji
Target: Inubashiri Momiji
Location (trigger): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
Explanation: Defeat Momiji to get past to the treasure cave.
Unlocks: Nothing


Defeat Suwako
Needs an Image Prerequisite: N/A
Trigger: Suwako Moriya
Target: Suwako Moriya
Location (trigger): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
Explanation: Suwako challenges you to a battle.
Unlocks: Nothing


Fantastic Wind Hole

To Fight or not to Fight
Needs an Image Prerequisite: Ask Keine (event)
Trigger: Minamitsu Murasa
Target: Minamitsu Murasa
Location (trigger): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
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): {{{triggerlocation}}}
Location (target): {{{targetlocation}}}
Explanation: The player must persuade Byakuren to join the party.
Unlocks: Byakuren Hijiri (playable character)



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