June 2nd is Diaper Day! Fair for the Picture Book 'Omutsu no Naka, Misete Misete!' Held

PIE International (Toshima-ku, Tokyo; President: Hiroyoshi Miyoshi) is holding a promotional fair in select bookstores to offer 'Nezumi-kun Name Seals' to customers who purchase the picture book 'Omutsu no Naka, Misete Misete!' in celebration of 'Diaper Day' on June 2nd. Simultaneously, an Instagram campaign to win 'Nezumi-kun' socks will be launched.

'Nezumi-kun Name Seals' perfect for nursery school supplies

These name seals feature Nezumi-kun and his friends. They are waterproof and durable, making them ideal for nursery school items.

* The sticker bonus applies only to the book 'Omutsu no Naka, Misete Misete!' * Bonuses are limited in quantity and available while supplies last. * Arrival dates and campaign start dates may vary by region and store.

Instagram campaign to win Nezumi-kun socks now underway!

To commemorate Diaper Day, the company is holding an Instagram campaign to give away a pair set of Nezumi-kun socks (adult and child sizes) to 5 winners selected by lottery.

How to enter: 1. Follow the official PIE International Picture Book & Children's Book account (https://www.instagram.com/pie__ehon/) 2. Like the eligible post.

Entry period: Tuesday, May 26, 2026 – Tuesday, June 9, 2026, 23:59.

Prize details: 'Omutsu no Naka, Misete Misete!' Socks - Women's (approx. 22–25cm) / Kids' (approx. 13–18cm) pair set.

Number of winners: 5 people.

Potty training while having fun with Nezumi-kun

Starting with 'Omutsu no Naka, Misete Misete!', which has sold over 500,000 copies domestically, the company offers various books and items that help children enjoy potty training alongside Nezumi-kun.

'Omutsu no Naka, Misete Misete!' Text & Art: Guido Van Genechten; Translation: Rie Matsunaga 'Omutsu no Naka, Misete Misete! Toilet Dekita ne Sticker Book' Text & Art: Guido Van Genechten; Translation: Erisa Adachi 'Omutsu no Naka, Misete Misete! Odekake Mini Book' Text & Art: Guido Van Genechten; Translation: Rie Matsunaga