Plot: Taikō Risshiden V is the latest title of a Japanese video game series Taikō Risshiden produced by Koei. It was released on PC and PlayStation 2 in 2004 followed by a port to PlayStation Portable in 2009. Wikipedia
Plot: Inindo: Way of the Ninja is a role-playing video game developed and published by Koei. Originally released for the PC8801SR, PC9801, MSX2 home computer and Sharp X68000, it was remade for the Super NES, which was also released in North America. The game is a fictional account of Japan's warring states...
Plot: P.T.O. IV, released as Teitoku no Ketsudan IV in Japan, is a World War II-themed strategy for the PlayStation 2 and PC produced by Koei. Wikipedia
Plot: Rise of the Phoenix is a multiplatform turn-based historic strategy video game made by Koei for the SNES, NEC PC-9801, and Sony PlayStation console devices. The game is set in ancient China during the Chu-Han Contention between Liu Bang and Xiang Yu in the 3rd century BC. Wikipedia