Before his change, Sawada was a kind-hearted figure as Mari remembered him, but he turned his back on his former friends and humanity. He has a habit of crafting animal origami and lighting them on fire just before going on a killing spree while listening to rap music, with the flame dying out the same time Sawada killed the last person.
He was eventually branded a traitor by Murakami for giving the Delta Belt to the surviving Ryusei School students, before going after them one by one. No longer a member of Lucky Clover as he still had a shred of humanity left in him, Sawada was seemingly killed by Takumi upon revealing his Orphnoch form.
But Sawada survived and begins to regain a bit more of his humanity, eventually beginning to feel the breakdown while taking Takumi's place in fighting the other Lucky Clover members, sustaining injuries from fighting all three of them and being hit by Kaixa's Gold Smash.
Sawada eventually crawled out of the battlefield and saw Mari one final time before dying.