Telecom Square Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; President: Yuji Yoshitake; hereinafter referred to as "the Company"), a global provider of cross-border mobile communication solutions, in collaboration with the Niigata Airport Promotion Council (Chairman: Hideyo Hanazumi, Governor of Niigata Prefecture), will conduct a campaign offering a free Korean eSIM with unlimited data and a local phone number to the first 500 passengers departing from Niigata Airport on night flights to Seoul between Wednesday, July 1, 2026, and Monday, August 31, 2026. The campaign aims to promote the use of this route, which has seen increased convenience due to the daily operation of flights between Niigata and Seoul, and to expand the use of eSIMs, which support communication environments abroad. An eSIM is an integrated SIM embedded in the smartphone itself. In recent years, eSIMs have gained attention as a highly convenient communication method due to the spread of compatible devices, their relatively low cost, the ability to reduce luggage, and the fact that they can be used immediately upon arrival without the hassle of swapping SIM cards, leading to their expanding use. Our service, "eSIM square," allows you to start communicating in just two steps. We also offer 24-hour support via email and chat during use, providing peace of mind for beginners. Background of the Campaign Starting June 1, the "Niigata = Incheon (Seoul) route" has been increased from the previous three flights per week to seven, operating daily. This expands options for night flights, and further increases in tourism and business travel are expected. This campaign is being conducted in collaboration with Niigata Airport to promote the use of the newly increased night flights and to provide more customers with an opportunity to experience eSIMs, which are gaining attention as a communication method for overseas travel. Going forward, the Company will continue to aim to provide new value and communication en