Plot: Shuyaku Sentai Irem Fighter is a 1993 strategy video game developed and published by Irem exclusively in Japan for the Nintendo Game Boy on July 30, 1993. It features characters from four of Irem's franchises: R-Type, Mr. Heli, Ninja Spirit, and Hammerin' Harry. Wikipedia
Plot: Hammerin' Harry, known in Japan as Daiku no Gen-san, is a series of platforming video games developed and published by Irem in 1990. The titles were developed and published for the arcades, Famicom, Game Boy, Super Famicom and Sony PSP platforms. Wikipedia