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EMPTY HOUSE is a quest in OMORI, serving as one of the mandatory HEADSPACE quests required for completion to progress the story. It is made available after collecting all correct keys for the HANGMAN game.
STORY[]

The group reaching the end of the Map of Truth after learning about Headspace's origins.
After HUMPHREY is defeated, the party has essentially lost their memories of BASIL and their main motive for exploring HEADSPACE. The whirlpool where HUMPHREY once resided now leads to the MAP OF TRUTH, a long winding corridor filled with red water.
Note that entering the whirlpool is optional as the player can alternatively head back to the UNDERWATER HIGHWAY and take PLUTO'S SPACELINE to VAST FOREST to initiate the quest.
Upon entering the MAP OF TRUTH, swimming through the corridor will periodically stop OMORI and the party as a disembodied voice provides exposition on his past adventures in the dream world and how the KEYS have repeatedly pointed them to the truth, before he resets the dream world to conceal it each time. This time, the KEYS all point to the heart of the VAST FOREST, and the projection of MARI, which OMORI has always regenerated, will guide him to it.

Stranger luring the group inside of Basil's House, now disoriented and withered away.
Talking to MARI after this point introduces this quest into her list. Your remaining task is to explore the world, collecting the KEYS to complete the HANGMAN puzzle. Once the HANGMAN is complete, the surroundings of BASIL'S HOUSE become deathly and foreboding, and its floor caves in, revealing the entry to BLACK SPACE.
Taking the road to his house shows that all his flowers have withered away, no longer responding to any attempts to water them, and that the walk through the forest has become abnormally long as the trees closer to his house are gradually dying. Upon reaching the house, a frightened AUBREY begs OMORI to turn back, but with nowhere else that leads forward, OMORI takes the plunge.
REWARD[]
Once OMORI falls asleep in NEIGHBOR'S BEDROOM, the quest will vanish from the list, never to appear again even after OMORI rebuilds HEADSPACE in the OMORI ROUTE.
QUOTES[]
The Truth about Headspace
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??? You have come again to seek the truth. ![]() ??? Each time, your adventures may be disparate. But as your journey nears its end... it will always lead you back here. ![]() ??? The truth. The truth is always the same. ![]() ??? The path to the truth was once here, but it has been removed. ![]() ??? It was moved to a lighthouse in a pier. ![]() ??? Then, to a library banished deep underground. And after that, to an old barn on a distant planet. ![]() ??? And... this time... it will be in the heart of a vast forest. ![]() ??? No matter how many times the path is concealed, the flower boy will always find it. And your dear sister MARI... she will always guide you to it. ![]() ??? Even as hollow shells, they will continue to evolve. And each time, they will grow wings... and fly too close to the sun. ![]() ??? It is their nature. They are the only ones who know... and one has carried it with her to her grave. ![]() ??? Death may be no danger here, but the memories of them do not fade so easily. Many times, your friends have met with an unfortunate fate. ![]() ??? Although they are revived time and again, the most haunting stay in this world... even if only their bones remain. ![]() ??? The long lost ones sink here... to the bottom of the DEEP WELL... and become nothing. ![]() ??? You have forsaken them, yet they still yearn for your care. Their souls know nothing but how to scream for help. Do you take pity on them? ![]() ??? Your dear sister MARI with a bad knee... You could not bear for her to die again, so she was given the safety of a picnic blanket. ![]() ??? Yet it is her nature to leave and to protect. And when she does, she will leave you again and be born anew... with the undying soul that you have cursed her with. ![]() ??? The souls assigned to your friends... They are fragile and must be protected. And so they must remain asleep. ![]() ??? Yet... The path to the truth is closer to your most precious room than ever before. Will you be able to bury it this time? ![]() ??? Perhaps it is too late for you. ![]() ??? Perhaps there is still hope for you. ![]() ??? You know of the KEYS to the other realm. They are different each time... but they will unlock the same door. ![]() ??? The end of this journey will lead to suffering... but if you do not face this, you cannot continue. ![]() ??? This form, though it has not shown its true self, is evil. You will not see that unless you fight it. ![]() ??? When your intentions become hazy, they will transpire into this world like a thick fog. You will know when it happens. It has already happened before. ![]() ??? At that time... return to where the truth was reborn... to the heart of the forest. ![]() ??? And like each time before it... attempt to rewrite your fate. ![]() ??? Will you be doomed to repeat this cycle over and over? Or will you break it? ![]() ??? Explore this world while you can, DREAMER. Until there is nothing left. ![]() |
Empty House (Unused Sequence) Part I
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Empty House (Unused Sequence) Part II
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Empty House (Unused Sequence) Part III
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MARI'S ADVICE[]
MARI (Empty House)
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TRIVIA[]

- Within the game files, there is data for an unused set of cutscenes that would have fleshed out the EMPTY HOUSE quest in its lead-up to BLACK SPACE. This was cut, presumably due to inconsistencies with the rest of the game.
- The line "Perhaps ______ for you", spoken by the disembodied voice within the MAP OF TRUTH, differs depending on which route the player is on.
- If the player is on the SUNNY ROUTE: "Perhaps it is too late for you."
- If the player is on the OMORI ROUTE: "Perhaps there is still hope for you."