Sakura Taisen Online (サクラ大戦オンライン) or Sakura Wars Online is a Sega Dreamcast game published in 2001 by Sega and developed by Overworks. It was an online community-based game in the Sakura Wars series, and the online services for the game were terminated in 2005.
The game featured Koi-Koi as a minigame.