My Sunshine City is an iPhone app developed by Sunshine City Corporation to enhance the convenience of using the Sunshine City complex in Ikebukuro. The app offers exclusive coupons, services, and event information tailored to your preferences. Users can register their favorite stores to stay updated on new products and campaigns promptly.

For Sunshine City workers, there are additional exclusive services available. Whether you are a frequent visitor to Sunshine City or a daily commuter, this app ensures that Sunshine City becomes a personalized haven for you.

The app's key features include easy search functions for shops, restaurants, and amusement facilities within Sunshine City, personalized news updates, coupon deliveries for in-house and nearby events, prioritized news for favorite stores, and a stamp card system for special rewards.