“Yeastken.” are mysterious creatures that are part bread, part dog. They are original characters created by Kamio Japan, with around 100,000 followers on X (formerly Twitter). The series depicts heartwarming daily life stories of Yeastken living in a bakery.

Every time you open this planner, your heart will feel warm. It features full-color pages with illustrations of Yeastken on every page. The planner also includes profiles of all 22 characters, and it is packed with newly drawn illustrations.

This monthly planner covers the period from October 2025 to December 2026. It measures 182 × 128 mm and contains 96 pages. The planner includes Japanese holidays, Rokuyo (traditional calendar markings), seasonal days, and other events. Both the previous and following months are included for easy reference. There is plenty of space for notes on the memo and grid pages, and an annual schedule page is also provided. The planner comes with a clear plastic cover and a ribbon bookmark.

Official X: @yeastken
Official info X: @yeastken_info
Official Instagram: @yeastken2022
Illustration: kodama © KAMIO JAPAN

Book details:

• Pages: 96
• Language: Japanese
• Publisher: Tatsumi Publishing
• Release date: September 8, 2025
• Size: 18.2 × 12.8 × 0.7 cm