Reborn as a Polar Bear: The Legend of How I Became a Forest Guardian(2017)

Shirokuma Tensei: Mori no Shugoshin ni Natta zo Densetsu

After devoted mountain climber Kumakichi Kumada falls into a ravine, he wakes up in the middle of a forest in another world...as a polar bear! Now this tough Ursus maritimus is looking after six werewolf sisters on the run from the humans tyrannizing their clan. Keeping his wits about him and using his knowledge from his past life, the next "mountain" for him to climb will be making a comfortable life in the forest for everyone!

(Source: Yen Press)