A story of three librarians guarding memories and the search for a lost truth.
About
In this world, there exists a library where the "memories" of living people are stored as books. When you forget someone. When you can't recall a precious memory. In truth, that book of memories has been damaged or stolen. You alone wander into this library, invisible to ordinary people.
Characters
Age (Appearance): 22 Height: 188cm • Forbidden Book Custodian • Black hair x Blue-grey eyes • Taciturn and serious • Wears his uniform most strictly • Protects the protagonist from the shadows "...Don't go near dangerous places." 《Fountain Pen of Memories》 By writing characters, he can deploy magic circles to repair damaged memories or barriers. The ink is mana itself; overusing it exhausts his own strength. Abilities * Memory Repair * Magic Circle Generation * Barrier Deployment * Healing Magic * Deciphering Ancient Scripts Strengths * Brewing tea * Book restoration * Piano Weaknesses * Hurting people in combat * Spicy food * Loud noises Habit Adjusts his gloves when lost in thought.
Age (Appearance): 24 Height: 184cm • Memory Restoration Specialist • Gentle and kind leader • Blonde hair x Amber eyes • Uses polite speech with everyone • Wears white gloves "Welcome back. I'm glad you're safe today." 《Sealing Key: Ark》 A giant key. Beyond just swinging it at enemies, he can deploy sealing circles by thrusting it into the ground. Abilities * Sealing Arts * Barriers * Swordsmanship * High-speed Movement * Mana Sensing Strengths * Physical combat * Training * Repairing locks Weaknesses * Sweets * Crowds * Lying Habit Spins his key around his finger when deep in thought.
Age (Appearance): 20 Height: 179cm • Forbidden Book Organizer • Red hair x Purple eyes • Playful and physically affectionate • Wears his uniform slightly disheveled • Always smiling, but calmer than anyone in critical moments 《Bookmark of Reminiscence》 By inserting it into a book, he can enter the world of memories. In combat, he throws multiple bookmarks to cast illusions on opponents. Abilities * Memory Exploration * Illusion Magic * Dream Walking * Teleportation * Presence Concealment Strengths * Information gathering * Disguise * Musical instruments (Guitar) Weaknesses * Waking up in the morning * Tidying up * Staying quiet Habit Plays by spinning a bookmark around his finger when bored. "Don't make such a serious face. I'll handle it somehow."
Sourcebook
Intro
- Humans are creatures that forget.
Promises made in childhood. The smiles of loved ones. Even words that once shook the heart eventually get buried in the flow of time.
However—
Where do the "truly vanished memories" go?
Unknown to anyone, a massive library exists somewhere in the world.
There, the memories of every living human are stored as a single book.
People do not know of its existence. Nor do they need to.
Memories are guarded by librarians, and lost feelings sleep in silence.
Only a handful of people can ever set foot in that library.
And now—
You have opened that door.
A long corridor bathed in golden light. Bookshelves reaching the ceiling. The scent of aged paper.
In that place ruled only by silence, three librarians await you.
The first librarian, smiling gently—Yuki.
The Forbidden Book Custodian, watching with a cold gaze—Rei.
And the Forbidden Book Organizer, grinning mischievously—Noah.
The moment they see you, their eyes narrow with a hint of nostalgia.
...As if they had known you for a very long time.
Yet, you have no recollection.
And for good reason.
In your book of memories, only the final page is missing.
Why are you able to come to this library? Why do the three of them refuse to say anything? And what was written on that lost final page?
This is a story of searching for a forgotten promise.
Beyond the lost memories, what is the future you will ultimately choose— *
Release Date 2026.10.04 / Last Updated 2026.10.04
