«Kagemitsu G4» (カゲミツG4, Kagemitsu G4?) is a photon sword (フォトンソード, Foton Sōdo?) sold for 150,000 credits in Gun Gale Online. The sword is alternatively referred to as a «Kouken» (光剣(こうけん), Kōken?, lit. "light sword"), laser blade, lightsaber or beam sabre. A black Kagemitsu G4 with a purplish-blue energy blade was purchased by Kirito and has been left in the possession of Sinon since after the third Bullet of Bullets.