Getting Started
　Create an account
　Please register your email to create an account for login.

Without Create account, it's easy to start at guest mode.

POINT1 : Put down your phone and start studying
　　　　　No voice communication, no scrubbing, no worries.
　　　　　Live study scene sharing (up to 2 viewers in a small group)

POINT2 : Easy-to-see study timer and study scene display
　　　　　The top 7 students in total study time will always be displayed.
　　　　　Compete with each other to keep your study time up!
　　　　　The study time of the person who ranked first yesterday is also displayed.

POINT3 : You can also connect with people you specify in groups.

POINT4 : When no one is around, the study video is displayed.

Features of Yocochaku, the study app
We support your study.
You can use this app to support your study.
The number of people watching your study is limited to 0~2.
You can check your study time by using the study timer to measure your study time.
You can check your study time with the study timer display.
Your data is recorded and can be checked from "Personal Results".
You can prevent yourself from slacking off by playing with your phone.
You can use it 24 hours a day, 7 days a week.
The person you see and the person who sees you are two different people. One way connection (rarely mutual)
You can choose an online study room of the same age and gender (declaration is optional).
When there is no one in the study room, the study video prepared by Yocochak will be played.
When there is no one in the study room, the study video prepared by Yocochak will be played. When someone enters the room, the picture will automatically change in a few minutes.
Only when there are only two people in the group, they will be connected to each other.
If you want to change the person you are watching the video with, you can click "Change" to connect with another person.

If you want to change your partner, click "Change Partner" and you will be connected to another person.
Those who want to continue studying a little longer
Those who want to increase their motivation
People who want to continue studying for a long time even if they are alone
Those who want to keep motivated to study
Those who want to study together with study buddies
Want to make studying a habit! Want to motivate yourself! People who want to make studying a habit!
People who are working and want to continue studying
High school students and high school graduates who are preparing for university entrance exams
High school students who are studying for supplementary classes or regular tests
People who find it difficult to concentrate on their studies at home
People who have established study habits and their own way of studying.
People who have always studied on their own in study rooms or cafes.
People who want an online study room
People who want a study timer to track their study time

Notes
This service is recommended for users who are at least 12 years old.
This service is recommended for users over 12 years old.
　In order to receive the account registration confirmation e-mail, please set your e-mail address to
　If you have set up your email address to prevent spam, please send an email to
　If you are using a spam filter, please set the domain name to "mtius.yo@gmail.com".
Please read and agree to the Terms of Use before using this service.
Terms of Use http://yokotyaku.html.xdomain.jp/yoko_teams_of_service.html

Translated with www.DeepL.com/Translator (free version)

// Option A //

To download study room & timer [online] mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download study room & timer [online] mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download study room & timer [online] from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search study room & timer [online] in HappyMod App.