AltPlus Inc. (3672.T) develops, operates, and supports smartphone-based social games and related IT services. The company provides original titles including the card RPG "忘却前夜," featuring regular new character awakenings and events such as those for "24," "マーフィー," and "リリー," alongside IP-based games like "ヒプノシスマイク -Alternative Rap Battle-," with full-voice events including "聖しこの夜はあなたとともに2" and "執事喫茶メヌエット2"; it also offers game support solutions for development and operations, human resources provision, offshore development, integrated security DxShield, and infrastructure management via GIMS. AltPlus operates primarily in Japan, targeting mobile gamers and social game operators through app stores. Founded in 2010 and headquartered in Tokyo at Sunshine 60 45F, 3-1-1 Higashi-Ikebukuro, Toshima-ku, the company employs around 217 staff. Recent developments include the full launch of "忘却前夜" in August 2025, a private placement of stock acquisition rights in November 2025 raising approximately ¥7.4 million from investors including Trust Up and Evolution Capital, and a capital and business alliance acquiring a 13.33% stake in Okazaki Holdings Inc.