Since 2009, the STEINS; GATE series has sold over 1,000,000 copies!
Hypothetical Science ADV “STEINS; GATE” is a spin-off game and Hypothetical *Second-grade Syndrome x ADV “STEINS; GATE Hiyoku Renri no Darling” has finally been released for iOS!

※This game is only available in Korean.

■ Sales copy
This story may be real?
This is the story of the Future Gadget Laboratory members.

■Product summary
Want to play more Hypothetical Science ADV STEINS; GATE games?
Why not try STEINS; GATE’s new slapstick comedy Hypothetical Second-grade Syndrome, which has finally been released!
The concept has changed compared to the previous dramatic story, as the game depicts the daily romantic lives of lab members, often with comedic effect!
The game is not only a slapstick comedy, but also includes many sweet and romantic scenes!
This spin-off game gives users the same thrilling experience and those who played the previous game will be able to take on the new challenge!

■ Features
* A romantic and comedic adventure game with the characters from STEINS;GATE!
*Phone trigger system optimized for iOS! The story changes depending on your preferences!
*Appear as six characters (including one male character) with individual endings for each!
*Full voice acting!
*The game has more than 20 hours total playing time!
* You can enjoy this game on either iPhone or iPad as a Universal app!
(The game is not optimized for iPhone5)
*Saved data is stored on iCloud! Play with different devices and share the saved data!
*Supports Game Center!
※Opening and ending sequences based on the Xbox 360 version.

■How to play
Easy intuitive touch screen!

・Basic controls
Phone Screen: Invoke phone trigger/Close
Using your two fingers (or pinch in): Menu display /Non display
Tap: Send text and OK
Swipe Down: Log screen display
Swipe Up: Hides message area display
Swipe Right: Skip read messages
Swipe Left: Skip Forced message
Tap & Hold (using one finger, press and hold): Auto mode

・Controls for iPhone
Hold mobile in portrait: Invoke phone trigger
Hold mobile in landscape: Close phone trigger
・Controls for iPad
Swipe up on the right edge screen: Invoke phone trigger
Swipe down the left side of phone trigger: Close phone trigger.

・Saved Data/ Backup to iCloud
Choose BACKUP from the SYSTEM on the title screen, and then you can backup the saved data to iCloud.
(Setup iCloud: You need to turn on Documents & Data.)

・Restore Saved data from iCloud
Choose RESTORE from the SYSTEM on the title screen, and then you can restore the saved data from iCloud
(The saved data on the device can be overwritten when you restore.)

Rintato Okabe, commonly known as Okarin is a University student, who is still stuck in *Second-grade Syndrome. He introduces himself as a mad scientist named Kyoma Hououin and he spends most of his time doing odd research with several members of the Future Gadget Laboratory, which is commonly called Lab. They accidentally find an invention, “D-mail,” which can send emails to the past.
One day, Okarin finds the lab members busily arranging a celebration party for a newly completed gadget. But, why have they produced a new gadget while Okarin doesn’t know anything about it? The number of lab members has increased from six to eight. It seems that they have changed the past with the D-mail inventions.
What’s more, due to the D-mail inventions, the electric bill has gone up immensely. Creating a cash flow problem for the lab. Therefore, in these circumstances the members plan to sell a new gadget to solve this financial difficulty.

*Second-grade Syndrome most commonly appears in the second year of junior high school (around 14years old). Symptoms include extremism, audacious behavior and hyperactivity, similar to mental illness. This syndrome occurs during adolescence.

What’s New

Version 1.04.0

-This version is compatible with iOS 12 and above.
-Fixed a bug that in-game menus etc. are not displayed correctly on some terminals.
-Fixed a bug that phone trigger does not appear.
-Fixed a bug that iCloud cannot be restored.
-The text color in the phone trigger is not changed in dark mode.
-Changed the handling of links. (Displayed in the safari app.)

Ratings and Reviews

3.9 out of 5
9 Ratings

9 Ratings

Skakeaa ,

Update please!!

This version of the game is too low that is incompatible

Parliamental ,

Worth every single cent I paid for

I watched Steins;Gate anime and loved it, so I decided maybe I should try play the games, too. Boy do I love the game. I enjoyed it just as much, if not more, as the anime. This game is definitely worth the price. If you liked the anime, don't hesitate to try this game.

As for compatibility, I don't know about iOS 10, but it works perfectly fine on my iPad Air 2 running iOS 9.3.2. No compatibility issues at all.

GMdest ,


The game itself is fine though I was a bit disappointed. The only thing I should blame is that there are some gram mistakes. Otherwise, worth to purchase.


1.7 GB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Infrequent/Mild Horror/Fear Themes
Infrequent/Mild Sexual Content and Nudity
Infrequent/Mild Cartoon or Fantasy Violence


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

More By This Developer

You May Also Like