Toguro has Yusuke on the ropes and begins to play with his mind to release what he wants to face: 100% of Yusuke's power! He learns from his former fighting partner, the late Genkai, currently possessing Puu, Yusuke's spirit beast, how to finally release that power. Unfortunetely for Yusuke, it involves killing his best friend.
With Kuwabara dead (I'm implying he's dead due to the fact that his heart seems to have been ripped out), Yusuke releases all the energy he can. With his final blow, he fires his spirit gun at maximum power, but Toguro counters with 120% of his energy! (Don't ask me how it's possible, I'm in advanced math and don't feel like trying to explain it even to myself)With that, Yusuke shatters Toguro's demon body he recieved from the Dark Tournament 50 years prior. Finally, HE"S DEAD!!!
In all: this is the greatest end to the series I could see! Even though Kuwabara and Genkai seemed to have died, I'm guessing they're coming back since they're in the movie, Poltergeist Report (see my other review there).