一心亭 is a mobile application developed by Active Media KK, available for iPhone users in the Lifestyle category. This app is designed for members of the Yakiniku restaurant chain, offering a Heartful Club program where users can accumulate points across various branch locations. Exclusive membership benefits are also provided, enhancing the user experience.

The key features of 一心亭 include a point system where users earn points based on their spending, with a conversion rate of 1 point to 1 yen for future use. Additionally, users can advance in membership ranks based on their spending, unlocking preferential point redemption rates and other perks. Regularly updated coupons, personalized messages, and detailed store information are also part of the app's services.