Kobito no Sheeta to Karigurashi no Mori

Sheeta and Nala live happily inside a hollowed-out log with their fellow "littlefolk," who stand no taller than a blade of grass. When Nala runs off one day to investigate a mysterious smoke signal, Sheeta must summon all his courage and wits as he sets off in pursuit. Rats, ants, weasels, giants... The wide world is full of dangers, but the plucky Sheeta will stop at nothing to find his friend.

(Source: Kodansha USA)