Popular Character 'Coji-Coji' by Momoko Sakura Joins 'Monthly Letter' Subscription! Calendar Correspondence Delivered to Your Mailbox Monthly

ROLLCAKE Inc. (Headquarters: 18-6 Sakuragaokacho, Shibuya-ku, Tokyo; CEO: Tadashi Ishida), a developer and operator of smartphone applications, is pleased to announce that subscriptions for the 'Monthly Coji-Coji Letter' on its calendar subscription service 'Monthly Letter' will begin on Wednesday, April 1, 2026, starting with the May issue delivery.

Letters from Coji-Coji Delivered to Your Mailbox Every Month

'Monthly Letter' is a subscription service that connects fans with their 'favorites' through monthly calendar-style correspondence from artists and characters.

Now, 'Coji-Coji' makes its debut in the 'Monthly Letter' lineup. Each letter delivered monthly features a seasonal new illustration and calendar on the front, with a message from Coji-Coji on the back. By decorating your room with these letters, Coji-Coji naturally blends into your life, creating an experience where your 'passion' becomes a seamless part of your daily routine.

Messages from Coji-Coji

The back of each letter contains a message from Coji-Coji. The content remains a surprise until it arrives in your mailbox.

■ Monthly Letter Service Overview

Monthly Coji-Coji Letter:

・Subscription Start: Wednesday, April 1, 2026
・Delivery Commencement: May 2026 Issue onwards
・Price: 385 JPY/month (tax incl.) *Trial price for first month: 165 JPY (tax incl.)
・Contents:
　・Front = Exclusive Illustration × Calendar
　・Back = Message from Coji-Coji
・Size: 19.4cm × 9.7cm
・Paper: High-quality thick paper (Vant Nouveau)
・Shipping: Standard Mail / Delivered late each month
・Packaging: Enclosed in transparent OPP sleeve

▼ Monthly Coji-Coji Letter Subscription Page

https://gekkan-letter.jp/@cojicoji

■ About 'Coji-Coji'

Created by Momoko Sakura, 'Coji-Coji' is popular for its fairytale worldview combined with profound words that resonate with adults and nonsense gags. Even 20 years after the anime first aired, the depth of the work continues to attract significant attention.

■ About 'Monthly Letter'

'Monthly Letter' is a subscription-based web service that connects fans with their 'favorites' through monthly calendar-style correspondence from beloved artists and characters. It features a wide range of partners including illustrators, manga artists, celebrities, athletes, and characters.

▼ Monthly Letter Website

https://gekkan-letter.jp

■ About ROLLCAKE Inc.

Representative: CEO Tadashi Ishida
Established: November 2013
Location: 5th Floor, Nippon Kaikan, 18-6 Sakuragaokacho, Shibuya-ku, Tokyo
Business: Development and operation of smartphone applications
Capital: 31 million JPY
https://rollcake.co

*Company names and product names mentioned are trademarks or registered trademarks of their respective companies.
*Information in this press release is current as of the announcement date and is subject to change without notice.