D4-mail Usage Guide

D4-mail is a service developed to deliver a more comfortable and convenient e-mail experience.

Using this unique e-mail service, you will exchange e-mails with the characters in the story to advance the story.

Please read the following notes to prepare yourself for using D4-mail to advance the story.

①Recommended browsers for D4-mail

D4-mail recommends different browsers depending on the device you are using. Please make sure that your device and the browser you use to launch D4-mail match the table below before starting the story.

Please note that if you proceed with the story without your terminal and browser matching the table below, you may not receive the mail correctly.

②About D4-mail notification settings

For a more immersive experience, we recommend that you set up notifications for D4-mail.

You can still progress through the story without notifications, but we recommend that you make the following settings to receive notifications.

If your device's OS is not up-to-date, you may not be able to use the following settings. If this is the case, please update your device's OS.

Also, please note that the notification function may not work with settings other than those listed below.

▼iPhone / iPad

▼Android

▼Mac / Windows

Now please proceed into the story.