After the hybrid bear crisis, Jerome and Lydia got 6 pups: four males and two females. One of them was Tonov. He/She and his/her siblings were born in autumn in Futago Pass, three days after the birth of Weed's and Koyuki's pups Bellatrix, Orion, Rigel and Sirius.
When a volcano erupts in Ōu, the dogs are forced to flee. Lenov is too small to run fast enough and is carried by the Ōu army to safety but they pass out from the smoke and ash in the air. Jinemon Kurohabaki finds them and takes them to an abandoned mine where he locks them up. Lenov and the others are later released by Daisuke who acquires the key from Jinemon.
A few months have passed since the defeat of Masamune Kurohabaki and peace reigns over Ōu. But the son of Akakabuto, Monsoon, attacks their paradise hoping to kill everyone living there and tries to take back his father's land.
Lenov is spending time with his family when suddenly those bears surprise them and attack them from all sides. While trying to excape, Lenov gets crushed under one of the bears paws, managing only to cry for his mother's help before being killed. His mother Lydia tries to save his body from further harm but is injured and killed in the attempt. Lenov's brothers, Akira and Tetsuo, then tries to help him too but get killed as well.
- His silver fur color isn't seen in any colored pictures but was mentioned in the story.