Yousei Daisensou ~ Touhou Sangetsusei (妖精大戦争 ～ 東方三月精) is a vertical "danmaku freezing" game. It is considered the "12.8th" official installment of the Touhou Project, being released between Double Spoiler (12.5) and Ten Desires (13). It is also based on the Touhou Sangetsusei manga series, sharing its Japanese name with said manga series.