Water Slider Debuts at WHATAWON's Giant Inflatable 'MJMJ'! Summer Operation Starts May 23, 2026

## Water Play Season Kicks Off! The Upgraded Giant Inflatable 'MJMJ' at WHATAWON

WHATAWON, a stay-type entertainment mall in Kishiwada, Osaka, will launch a new 'water slider' at its giant inflatable attraction, 'THE MEGA JUMP MOUNTAIN JAPAN (MJMJ),' starting May 23, 2026 (Saturday).

This year, the attraction has been scaled up as the 'New MJMJ,' featuring newly added giant sliders and a large athletic area. With water running down the slides, it provides a 'soaking wet' experience perfectly suited for the hot summer season.

## A Popular Spot for the Whole Family

Following last year's SNS success, this 'soaking wet attraction' returns. The sight of children laughing and splashing is sure to boost the summer mood, making it an ideal destination for family outings, friends, or weekend leisure.

## Worry-Free with Rental & Sales Items

Even without preparation, you can enjoy yourself comfortably. The following items are available:

[Rental]
- Life Jackets (M/L sizes): 500 yen
- Kids' Swimwear: 500 yen
- Face Towels: 130 yen
- Bath Towels: 220 yen
- Towel Set: 300 yen

[Sales]
- Swim Diapers
- Towels

Registration is handled at 'Kyomachi Yuya SOKOTOTO' within WHATAWON.

## Enjoy a Full Day at WHATAWON!

WHATAWON is a complex facility offering dining, shopping, events, and a dog park. Beyond playing, visitors can relax in cafes or spend quality time with pets, allowing for a variety of styles to enjoy the day.

## Operational Overview

- **Event Name:** THE MEGA JUMP MOUNTAIN JAPAN (MJMJ)
- **Start Date:** May 23, 2026 (Sat)
- **Operating Hours:** 11:00 - 18:00
- **Location:** WHATAWON Lawn Area
- **Address:** 1-32-1 Kishinooka-cho, Kishiwada, Osaka

**[Rates]

- **Weekdays:** Unlimited time 900 yen
- **Weekends/Holidays:** 30 minutes 600 yen, 1 hour 1,000 yen, extension 30 min 550 yen