I didn't see this posted, so check this corner combo out (normally after tsubame, staffless)
5B, 2C, 3C, 623D (koti), 2B, 2C, jC, D, falling B, djB, jC, D.
It works on Ragna, and it resets so you could do it again or shinshin. The final D is situational, and you can always not hit D to keep it.