Flaming Guillotine is Ikaruga and Yomi's Secret Fusion Ninja Art in Senran Kagura 2: Deep Crimson. It requires at least 3 ninja art energy scrolls from both of them to use. Like all Secret Fusion Ninja Arts, its power increases with the characters' mutual affection.
Ikaruga encourages Yomi for complete cooperation as they prep for their attack. Ikaruga provides the flame while Yomi provides the wind as they both raise their blades, cross and swing them in unison. The force creates a flaming, cyclone attack of which devastates any and all nearby enemies in the surrounding area.