
2026/08/25 Update
・簡体字版の誤字を2か所修正しました。 ・一部設問に複数の回答が想定できてしまったため、変更しました。 ・Fixed 2 typos in the Simplified Chinese version. ・Changed some questions because multiple answers were possible.…




Cyber Detective L solves Paradoxes—bizarre incidents by supernatural Demons—via the social media giant Parrotter. The Cyber Detective Squad, L and his Demon partner Nyasuteria, wield elite hacking and psychic powers to take on the final Paradox investigation.
Supported Languages: Japanese, English, Simplified Chinese
(Simplified Chinese support planned for August 2026)
Can you identify the culprit behind a supernatural murder using nothing but information from social media timelines—without ever leaving your room?
Humans with supernatural powers are known as “Demons”.
The bizarre incidents they cause are called “Paradoxes”.
Demons' Timeline is a mystery adventure game in which you investigate the truth behind these Paradoxes from the perspective of the Cyber Detective known as “L”.
Your partner, a Demon named Nyasuteria Hakouchi, assists your investigation with special abilities.
You will never visit a crime scene in the real world.
All clues exist online.
Using only information found on the internet, uncover the truth behind these strange and complex Paradoxes.

Players read through large amounts of information and solve deductions entirely through point-and-click interactions.
Each chapter features one or two timelines to investigate.
By analyzing witness statements, news posts, and social media messages, players complete multiple deduction tasks and gradually reveal the full picture behind each case.
Carefully read the information flowing through the timeline.
Deduce the owners of both public accounts and hidden alternate accounts, and connect them together.
Clues hidden within posts—such as age, gender, occupation, and relationships—help identify the people involved in the case.
Recover deleted data by discovering the correct restoration passwords.
Progress through the investigation by correctly quoting posts that serve as evidence for your deductions.
Use the hashtags obtained from the timeline to fill in the final reasoning.
Complete the deduction and confirm the truth behind the case.

There are correct and incorrect answers during the investigation,
but there are no time limits and no game overs.
A hint system is available, allowing players to continue the story until the end.
Because of the large amount of information involved, the game offers a challenging detective experience that rewards careful reading, information filtering, and logical thinking.
A free demo is currently available, allowing you to play up to Chapter 1.
・Chapter 1 out of 7 total chapters
・Estimated playtime: 1–2 hours
・Save data can be carried over to the full version

Also, this game allows unrestricted live streaming and video uploads (including monetized ones) — no permission needed from us!
However, since seeing the full story beforehand may reduce the enjoyment of purchasing and playing the game yourself, we kindly ask that you include spoiler warnings in titles, descriptions, thumbnails, etc. (e.g., "SPOILER ALERT" or "Full Story Spoilers Ahead").
Demons' TimelineSteam patch notes
・簡体字版の誤字を2か所修正しました。 ・一部設問に複数の回答が想定できてしまったため、変更しました。 ・Fixed 2 typos in the Simplified Chinese version. ・Changed some questions because multiple answers were possible.…
Demons' TimelineSteam patch notes
簡体字版の誤字をいくつか修正しました。 已修正简体字版中的几个错别字。
Demons' TimelineSteam patch notes
Ver2.0 簡体字に対応しました! Now supports Simplified Chinese! 已支持简体字!
Demons' TimelineSteam announcement
Attention, Cyber Detectives! Demons' Timeline now officially supports Simplified Chinese! This update adds Simplified Chinese localization to all of the following content: Full…
Demons' TimelineSteam patch notes
Ver1.7 英語で開始するボタンが無効化になっていたため修正しました! The "Start in English" button was disabled, so I fixed it!
Demons' TimelineSteam patch notes
・クレジットの記載に欠けがあったため修正 ・パロートの投稿日時に矛盾があったため修正 ・最終タスクの表現に矛盾があったため修正 ・最後の会話テキストにおいてキャラクターの立ち絵に矛盾があったため修正 ・〇〇〇〇〇教団のタイムラインでデスクトップ上のアプリがクリックできないバグを修正…
Demons' TimelineSteam patch notes
〇修正した不具合 ・クレジットの記載に欠けがあったため修正 ・ある人物の誕生日に矛盾があったため修正 ・クリア済みの最終推理のボタンを押せてしまう不具合を修正 ・ChapterSelectからにゃすてりあの通話に出ると会話が始まらない不具合を修正 ・ある順番でChapterSelectを選ぶとローディングのゲージが止まってしまう不具合を修正…
Demons' TimelineSteam patch notes
・あるアカウントのプロフィールに不適切な表現があった箇所を修正しました ・ChapterSelectで過去の人物の素性が正しく割り当てられていない不具合を修正しました 現在、原因を調べているバグは以下の通りです。 ・1度ゲームをクリアしてエンディングを見た後にChapterSelectから開始し、にゃすてりあの通話に出た後にゲームが進行しなくなる…