Denryujin

The Transformation Ninjatou-Flute Denryujin (変身忍者刀横笛電竜刃) is a sword/flute hybrid weapon created by Goro Izumi, created especially for Taki that not only allows her to wear the Raijin Armor, but also doubles as her main weapon when wearing the said suit.

Transformation
TBA

Behind the Scenes
The Denryujin is voiced by Mai Fuchigami (渕上 舞), who also voiced A.G.N.I., the G-Bracer, G7 Jet Visor and the non-Build Driver G7 variant weapons.