Steam

The Lost Study

Also known as The Lost Study, lost study, ls

A forgotten study. Lost because no one remembers it. Solve puzzles, recover stories, and restore it — one chapter at a time. 14 stories, 14 worlds. Cozy, eerie, funny, and strange. They seem completely unrelated. Until they're not.

Last update

29 Jul 2026

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Latest update

Patch notesPublished 30 Jun 2026

[Record] The Secret of Ru, the Mysterious Girl 🔍

Hello everyone, this is Guri, the Background Art Illustrator for the SONAK: Story Design Project. I work on the background art that helps you immerse yourself even deeper into the world of the Study. Starting this week,…

1 changeGameplayRead patch notes

Update history

Browse past updates and patch notes for this game.

12 updates

July 2026
Hello everyone, this is Guri, the Character Skin Artist for the SONAK: Story Design Project. I work on creating character skins so that the protagonists of the Study can transform into all kinds of new looks. It's the e…2 changesUI/audio28 Jul 2026
[Record] Ru's Beach Escape Adventure 🔍Hello everyone, this is Guri, the Character Artist for the SONAK: Story Design Project. I work on making the characters of the Study feel more alive. With sudden showers pouring one after another in the second week of J…Event2 changesMaps14 Jul 2026
June 2026
Hello everyone, this is Chelly, the Content Planner for the SONAK: Story Design Project. From in-game content to marketing content, I work on making SONAK's world even more vibrant and colorful. 🌈 Following our previou…1 changeGameplay16 Jun 2026
Hello everyone, this is Chelly, the Merchandise Designer for the SONAK: Story Design Project. My role is to design and create various items that bring the elements of the Study into your everyday life. 👩‍💻 June has ar…1 changeCompatibility02 Jun 2026
May 2026
[Record] A Special Week: An Invitation to the Summer Festival 💌Hello everyone, this is Chelly, the Quiz Designer for the SONAK: Story Design Project. My role is to plan various quizzes so that you can enjoy the stories within the Study in even more engaging ways. It is already mid-…Event2 changes19 May 2026
Hello everyone, this is Cooka, PD of the SONAK: Story Design Project. With spring in full bloom this May, I come bearing a very special announcement. We are thrilled to introduce a new Chronicler who will join us in unc…2 changesGameplay05 May 2026
April 2026
Hello everyone, this is Cooka, the Translator dedicated to bringing the records of the Study to a wider world. As we reach the end of our April journey tracing Airan’s past, I have secured some intriguing archives for y…2 changesBalanceGameplay21 Apr 2026
Hello, I am Cooka, the Game Designer who designs the various puzzles and mysteries within The Lost Study. As the spring air fills the first week of April, I have returned with a new webtoon featuring Airan’s second stor…3 changesGameplay07 Apr 2026
March 2026
Hello, I am Cooka, the Lead Storyteller managing the records of The Lost Study. 📽️ New English Trailer Added We have updated our introduction video with a seamless English version to better showcase the world of The Lo…3 changesUI/audioGameplay24 Mar 2026
Hello, I am Cooka, the PD of SONAK: Story Design Project. I would like to express my deepest gratitude for the warm welcome and 'Wishlist' support you showed during our first greeting on Steam last February. Inspired by…2 changesGameplay10 Mar 2026
February 2026
Hello, we are SONAK: Story Design Project, the developers of . After a long period of preparation, we are thrilled to finally greet Steam users for the first time! We are excited to take our first steps…3 changesGameplay03 Feb 2026

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[Record] The Secret of Ru, the Mysterious Girl 🔍

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