Sekai Project is an American video game publisher. They are known for licensing and translating Japanese visual novels into English, but they also publish original English visual novels developed outside of Japan, manga, and other non-visual novel video games. The company originated in 2007 as a fan translation group translating the visual novel School Days. They later partnered with publisher JAST USA, turning their fan translation into the official English version of the game.
Official website: https://sekaiproject.com/