In 2003, Hisaya became involved with the dōjin circle "Black box" where he was put in charge of their first dōjin visual novel Limit Off. Hisaya was even able to write the lyrics for the game's theme song "Real intention", something he had never done before. However, even with anticipation mounting, in August 2003, the project was frozen and has never been restarted again.
In 2003, Hisaya collaborated with the dōjin circle "Black box," where he assumed responsibility for their debut dōjin visual novel Limit Off. He even created the lyrics for the game's theme song "Real intention," a task he had never tackled before. However, despite growing enthusiasm, the project was suspended in August 2003 and has remained unfulfilled.