Silver Days: Battle Fusion

Silver Days: Battle Fusion (銀デイズ：バトルフュージョン), also known as Duel Fusion (デュエルフュージョン), is a fighting game based on the Silver Days series, developed and published by Alex Guy and his studio, SEVENS. The game was released exclusively online on June 15, 2010.

Initially created as a more simplistic online multiplayer game, Battle Fusion includes major characters from the first five story arcs of the series, from School to Kingdom Island. To accompany the original manga, the game contains a story mode that loosely represents the battles and major events that transpired in the manga, at the time of the game's release.

In early 2015, Battle Fusion's online multiplayer support was discontinued as updates for the game ceased. An upgraded version, Silver Days: Battle Evolution+, was released five years after the game's initial release.