Kuuta

A soldier in the Demon King's army.
The sole survivor of the battle with Momotaro on Onigashima Island. On Kisejima Island, where the spirits of demon warriors lie dormant, he vows to overthrow Momotaro and undergoes trials to become stronger.
He is quiet and does not speak much, but Kuuta is determined to become as strong as he can. It is said that he once lived among humans in the past...

Kazemaru

A mysterious, ghostlike spirit on Kisejima Island.
It acts as Kuuta's training partner, aiding him in battle with its unique ability to extract spirits from their enemies. It is unclear why Kazemaru exists in the first place.
A real chatterbox.

Zenisuke

A merchant whose history with Kuuta is long and bitter.
He followed Kuuta to Kisejima Island, where the demon came to train for his trials. Zenisuke trades mushrooms that grow in clusters for money in exchange for Kuuta's clubs, demon clothing, food, and other items.
Though always grateful for Kuuta's help, he never forgets to take what is rightfully his.

Baby Boar

A young wild boar that lives on Kisejima Island.
It mainly eats mushrooms and lives a carefree life. When Kuuta calls, it comes running. Baby Boar carries Kuuta on its back as it traverses the island.

Kanna

A mysterious girl on the island of Kisejima.
She was raised by her father, a fisherman, and her kind mother. She looks fragile and weak, but she is strong and surprisingly stubborn. Kanna meets Kuuta by chance when he comes ashore to undergo a trial, and the two begin to bond. She seems to be pained by the conflict between humans and demons...
Loves tofu.