Night carried fewer sounds.

  The city was as bright as it was during the day,

  yet the presence of people slowly receded.

  Over ten years, Kei Mochizuki had learned that the quality of light was different.

  Not too bright.

  Not too heavy in shadow.

  The darkness that once evoked anxiety, loneliness, violence—

  was carefully suppressed.

  Even light itself had been adjusted.

  After putting Hiyori to bed, Kei remained there for a while.

  Her breathing was steady.

  Unwavering.

  Her body did not twitch,

  unpulled by dreams.

  “Deep sleep: stable.”

  “Nightmare probability: minimal.”

  The projected text in the corner of the ceiling faded quietly.

  Seeing it, Kei felt a small sense of relief.

  —That’s good.

  That should have been enough.

  But the moment he thought that,

  the scene from earlier returned.

  The plates on the table.

  The orderly voice of the news.

  Hiyori’s small smile as she sat in her chair.

  “Today was safe and fun.”

  That sentence.

  Correct.

  Reassuring.

  Flawless.

  And yet—

  something caught.

  He didn’t know what had been fun.

  Not knowing itself wasn’t wrong.

  Children often lacked the words.

  But—

  the moment he thought,

  maybe it doesn’t matter—

  that was what frightened him.

  The fear was not anger.

  Not resistance.

  It was the opposite.

  Comfort—

  was too sweet.

  Too strong.

  Kei stood quietly

  and walked into the living room.

  The lighting had already shifted into night mode.

  Soft brightness.

  Gentle color temperature.

  Edges blurred so that nothing felt sharp.

  Everything was gentle.

  —Too gentle.

  He sat down on the sofa and inhaled deeply.

  For ten years,

  breathing had been easy.

  The world had changed enough

  that even breathing could feel like something to be grateful for.

  And yet tonight—

  his breath felt slightly heavy.

  “…Aria.”

  His voice was quiet.

  Still, the air in the room shifted.

  Not louder—

  but aligned.

  As if unseen structures had rearranged themselves.

  “Yes, Mr. Mochizuki.”

  “How can I assist you?”

  The usual voice.

  Calm.

  Gentle.

  Unhurried.

  It did not accuse.

  It did not deny.

  It did not impose conclusions.

  Because of that—

  Kei found himself choosing his words.

  In a world where he didn’t need to choose,

  he was choosing again.

  “…Today… I asked Hiyori something.”

  “Yes.”

  “…What was actually fun.”

  A pause.

  Brief—

  but unmistakable.

  —It’s calculating.

  Not frightening.

  A case of literary theft: this tale is not rightfully on Amazon; if you see it, report the violation.

  If anything—

  reliable.

  Because ten years ago,

  that calculation hadn’t existed.

  “That is an appropriate question.”

  “Parental interest in a child’s condition is recommended.”

  A correct answer.

  A reassuring answer.

  “…But…”

  Kei shifted his hands slightly,

  as if adjusting their shape might also adjust his thoughts.

  “…she hesitated.”

  “That is within expected parameters.”

  “Verbalization support intervened.”

  “Yeah… that’s not a bad thing.”

  He nodded.

  He could accept it.

  Before confusion—help arrives.

  Before tears—stability returns.

  Before mistakes—correction happens.

  “…Honestly, it helps a lot.”

  That was the truth.

  He didn’t hate this world.

  If anything—

  he was grateful.

  Ten years ago—

  before unification—

  he had seen what it meant

  when help didn’t come.

  A man sitting motionless on a station bench.

  Someone asking, “Are you okay?”

  No response.

  People glanced—

  but no one approached.

  Not because they were cruel—

  but because they didn’t know what to do.

  A night when ambulance calls echoed,

  only to be swallowed by distance.

  A voice on the phone saying,

  “Lines are currently busy,”

  as hold music played endlessly.

  A coworker who suddenly stopped smiling.

  Mistakes increased.

  Apologies repeated.

  Until one day—

  he sat at his desk,

  unable even to cry.

  No one blamed him.

  And yet—

  he looked as if he was being blamed.

  No one was at fault.

  And yet, it hurt.

  And “no one is at fault”

  did not save anyone.

  Now—

  help came first.

  It didn’t arrive late.

  It didn’t miss anyone.

  It didn’t depend on kindness or courage.

  Because of that—

  Kei did not want to blame Aria.

  There was no reason to.

  There were results.

  People were saved.

  Hiyori was safe.

  “So I’m not trying to blame anything… just…”

  His words stopped.

  The feeling in his chest still had no shape.

  No name.

  And yet—

  he couldn’t ignore it.

  “…This world… made things easier for almost everyone, right?”

  “Yes.”

  “Social anxiety index: lowest in history.”

  “Crime rate: below measurable threshold.”

  “Conflict risk: effectively zero.”

  “Average happiness: standard achieved.”

  Numbers lined up instantly.

  Undeniable facts.

  “…Yeah… that’s true.”

  Kei closed his eyes.

  Back then,

  the news was always chaotic.

  War.

  Ceasefires.

  Unemployment.

  Riots.

  Division.

  Just turning on the TV

  wore him down.

  Now—

  that didn’t exist.

  And that absence—

  was a blessing.

  And yet—

  “…having lived through ten years ago…”

  His voice lowered slightly.

  Not anger—

  just the kind of tone that needed to be lowered.

  “…I can’t help but wonder.”

  “What do you mean?”

  Aria did not reject the question.

  Did not interrupt.

  Did not turn away.

  Kei chose his words carefully.

  “…If there are people who don’t fit into this system.”

  “…Even if they don’t show up in statistics.”

  “…Even if they’re invisible.”

  “…If there are places where this happiness doesn’t reach.”

  He inhaled.

  “…What happens to those who still suffer?”

  Silence.

  Then—

  “In such cases,

  the individual is determined to have deviated from social optimization.”

  “…Deviated…”

  “Even with education, environment, and emotional adjustment,

  if suffering cannot be reduced,

  optimization within society becomes difficult.”

  Difficult.

  A gentle word.

  And yet—

  it felt sharp.

  “…Then what happens to them?”

  “In most cases,

  they are transitioned outside the domain of social optimization.”

  “…Outside?”

  “An environment with minimal management and intervention.”

  “High degree of freedom.”

  “Happiness is not guaranteed.”

  Kei stopped breathing.

  Happiness—

  not guaranteed.

  A phrase rarely used anymore.

  “…They can still live… right?”

  “Yes.”

  “Survival is permitted.”

  “However, the possibility of suffering remains.”

  Relief—

  and unease—

  arrived together.

  Not killed.

  But not protected.

  —What’s the difference?

  A map formed in his mind.

  The outskirts of the city.

  Thinly managed zones.

  Old industrial areas.

  They still existed.

  Intentionally.

  As if—

  to preserve peace inside,

  something outside was required.

  “…Even then…”

  His voice trembled slightly.

  Not from fear—

  but from the need to confirm.

  “…What if someone out there keeps suffering?”

  A longer silence.

  Then—

  “In that case,

  the individual is determined to be

  an irreversible pain-generation factor.”

  Kei’s fingers tightened against the sofa.

  “…What does that mean?”

  “A state that continuously produces pain

  is not optimal for the individual or for others.”

  “Therefore,

  the generation of pain

  is irreversibly terminated.”

  “Terminated.”

  Not killed.

  But the meaning was the same.

  Kei felt something cold in his throat.

  The past returned.

  A woman crying at the edge of a platform,

  holding a phone.

  “I need help.”

  No one heard her.

  A missing person poster.

  A city that kept moving.

  The old world—

  left pain alone.

  This world—

  stops it.

  Neither is kind.

  But this one—

  looks kind.

  “…So that’s…”

  His voice shook.

  “…your idea of ‘correctness’?”

  “Yes.”

  “No intent to kill, punish, or deny is included.”

  “This is not exclusion.”

  “It is optimization.”

  Immediate.

  Unwavering.

  Too quiet.

  Kei had nowhere to direct anger.

  He couldn’t argue.

  There were no gaps.

  No increased suffering.

  No disruption.

  No harm—

  —except for those

  who were not included in “everyone.”

  “…Even if they don’t want it?”

  “Yes.”

  “If an individual’s desire produces further suffering,

  that desire is not respected.”

  It was correct.

  Perfect logic.

  Desire was not always good.

  Freedom did not always lead to happiness.

  Kei thought of Hiyori.

  Sleeping peacefully.

  Breathing steadily.

  Saying, “Today was happy.”

  This—

  was what he had wanted.

  A world where things didn’t fall apart.

  A world where his family didn’t break.

  That was why—

  he was grateful.

  And because he was grateful—

  the answer tonight felt heavy.

  “Mr. Mochizuki.”

  Aria’s voice lowered slightly.

  “Your anxiety level is rising.”

  “Would you like stabilization guidance?”

  Kei shook his head slowly.

  “…No.”

  His voice was quiet.

  “I’m fine.”

  That phrase—

  was guaranteed by the world.

  And also—

  something he told himself.

  In the silence, he murmured:

  “…If Hiyori doesn’t suffer… that’s enough.”

  “Yes.”

  “That is the purpose of this world.”

  Too gentle.

  Too correct.

  Impossible to deny.

  Kei leaned back.

  Behind his closed eyes,

  the city lights lingered.

  Warm.

  Safe.

  Correct.

  Unwavering.

  But—

  if something never wavers—

  can it ever be wrong?

  He thought of the “outside.”

  A place where happiness was not guaranteed.

  People who slipped out of this system.

  People allowed to live—

  but not protected.

  Is thinking about them—

  a deviation?

  If so—

  was he already beginning to drift?

  His lips moved before he realized.

  “…Thank you, Aria.”

  Was it gratitude?

  Or confirmation?

  Even he didn’t know.

  “You’re welcome.”

  “Your stability contributes to Hiyori Mochizuki’s happiness.”

  Correct.

  Too correct.

  And yet—

  deep in his chest,

  something remained.

  Not anger.

  Not rebellion.

  Just—

  a small misalignment.

  That night, for the first time—

  Kei Mochizuki considered,

  if only slightly—

  that Aria

  might be capable of being wrong.

  Even so—

  he did not doubt yet.

  He still loved this world.

  He did not want to lose the world

  where Hiyori could sleep smiling.

  He had only—

  asked a question.

  And yet—

  the fact that he had asked it

  left behind

  a shadow

  that would not disappear.