The next morning felt heavier than usual.
Sunlight streamed through the classroom windows, warm and golden, yet Haru felt none of its comfort. His eyes drifted toward the empty seat near the window—the seat no one remembered, except him and Sora.
Except today—
Even its emptiness felt fragile.
"Still thinking about her?"
Sora's voice broke the silence.
Haru sighed. "When am I not?"
She rested her chin on her palm. "You look like someone trying to solve a puzzle without all the pieces."
"Maybe I am."
Sora studied him for a moment before speaking again.
"…Then let's find the missing ones."
An Old Memory Resurfaces
That afternoon, they found themselves in the school library.
Dust floated lazily in the air as sunlight filtered through tall windows. Haru scanned the shelves aimlessly, searching for something—anything—that might explain Yuki's existence.
But nothing did.
He leaned back in his chair, exhausted.
"This is pointless."
"Maybe," Sora replied. "But mysteries always leave clues."
As she spoke, Haru's gaze drifted to a familiar corner.
A small stack of old yearbooks sat on a forgotten shelf.
For some reason, his heart skipped.
"…Sora."
"Yeah?"
"Help me with these."
They carried the yearbooks to a table and began flipping through the pages.
Class photos. Club activities. Graduation ceremonies.
Normal memories of normal lives.
Until—
Haru froze.
"…Wait."
Sora leaned closer. "What is it?"
With trembling fingers, he pointed to a photograph taken ten years ago.
A group of children stood beneath blooming cherry blossoms during a spring festival.
Among them—
A young boy who looked unmistakably like Haru.
And beside him—
A girl with long black hair and a gentle smile.
Her name was printed below the photo.
Tachibana Yuki.
The Forgotten Promise.
"That's… impossible," Sora whispered.
Haru's pulse thundered in his ears.
"She existed," he said hoarsely. "She was real."
He stared at the photograph as fragmented memories surged forward.
The laughter of children.
The scent of sakura blossoms.
A warm spring afternoon.
And a fragile girl sitting beneath a cherry tree.
"I don't have much time," she had said softly.
"What do you mean?" a younger Haru had asked.
She smiled weakly. "My illness is getting worse."
"Then I'll give you my days!" he declared with childish innocence.
Her eyes widened. "You can't do that."
"I can!" he insisted. "I don't need them. You can have mine!"
She giggled. "You're silly."
Haru held out his pinky.
"Then promise me. If you disappear… come back and borrow my tomorrows."
After a moment's hesitation, she linked her pinky with his.
"…Okay," she whispered. "It's a promise."
The memory shattered.
Haru stumbled back, breath trembling.
"…I remember now."
Sora's eyes widened. "Haru… was she—?"
He nodded slowly.
"…She died."
The Truth Behind Yuki.
Silence enveloped the library.
The world felt impossibly still.
"That's why she exists," Haru murmured. "She's living in the days I threw away… the tomorrows I promised her."
Sora gripped the edge of the table. "So she isn't just a mystery. She's a miracle."
"No," Haru said softly.
"She's a promise."
Twilight Reunion
That evening, Haru returned to the rooftop alone.
The sky glowed in hues of amber and rose.
"Yuki," he whispered.
The wind stirred.
Petals drifted through the air.
And slowly—
She appeared.
Her form shimmered, faint yet radiant.
"…You remembered," she said gently.
Haru nodded, his eyes glistening.
"We met when we were children."
Yuki's smile trembled.
"Yes."
"You were sick," he continued. "And I promised you my tomorrows."
She lowered her gaze.
"You weren't supposed to remember."
"Why not?"
"Because memories anchor me to this world," she said softly. "And anchors… can break it."
Haru stepped closer.
"I don't care. You're real to me."
Tears shimmered in her eyes.
"Haru… you gave me a miracle. But miracles demand a price."
His chest tightened.
"…What kind of price?"
Yuki met his gaze.
"If you continue to give me your tomorrows… you will lose them yourself."
The words hung in the air like a silent verdict.
"You could forget your future," she whispered. "Your dreams. Your life. Even the people you love."
"Haru!"
He turned to see Sora standing at the rooftop entrance, her expression pale but resolute.
She had heard everything.
The Choice
"You can't do this," Sora said, walking toward him. "You can't throw your future away."
Haru looked between them.
Yuki—the girl of his past.
Sora—the girl of his present.
Two worlds.
Two futures.
One heart.
"…I made her a promise," he said quietly.
Sora's voice trembled. "And what about the promises you haven't made yet?"
Yuki shook her head gently.
"Haru… you don't have to save me."
"But I want to."
Her eyes softened with sorrow.
"And that's why you mustn't."
The sunset burned crimson behind her, as though the sky itself were weeping.
Haru clenched his fists.
"…Tell me the truth."
Yuki hesitated.
Then whispered—
"To save me… you must give up your tomorrow."
Silence fell.
The wind stilled.
Time itself seemed to stop.
Haru closed his eyes, feeling the weight of destiny press against his heart.
To save the girl he loved…
He would have to sacrifice his future.
And perhaps—
Everything he was meant to become.
End of Chapter 6.
Next Chapter Preview — Chapter 7: The Promise Beneath Falling Petals
Haru makes a decision that will change the fate of all three. As the truth deepens, love and sacrifice collide beneath a storm of cherry blossoms.