What system was "Touhou: Highly Responsive to Prayers" released on?

Touhou: Highly Responsive to Prayers was released on the PC-98 system because it was the primary computer platform developed by NEC in Japan during the late 1980s and early 1990s. The game was created by Team Shanghai Alice, headed by ZUN, who initially programmed the Touhou series for the PC-98 before transitioning to Windows platforms. The PC-98 system was chosen as the initial platform for the game's release due to its popularity and accessibility among Japanese gamers at that time.