Home Run Nighter: Pennant League!! is a baseball simulation game developed and published by Data East in Japan on March 31, 1989, for the Nintendo Famicom. Players can choose from 12 teams and enjoy two core modes: Exhibition Match for quick single games, and Pennant Race, the main tournament mode with save progress to compete for the league title. It features simple, intuitive controls for easy pick-up-and-play fun, with standout graphics and sound for the Famicom era that capture the authentic baseball atmosphere. Released exclusively in Japan with no international localization, its content is rooted in Japanese baseball culture and league structure. Overall, it stands as one of the most beloved sports games on the Famicom, drawing in baseball fans and gamers alike with its varied modes and realistic gameplay.