Chibikoro Tenseisha no Mofumofu Morigurashi The Comic

Sōta wakes up in an unfamiliar forest. And next to him… a talking bird and a giant cat fast asleep—wait, did I just… shrink!? Guided by voices calling for help, Sōta is reincarnated into this world as a three-year-old child. When he wakes Haku, the giant cat who rules the forest and has been causing the drought, all sorts of creatures take notice! Thus begins Sōta’s life in the otherworldly forest, navigating his tiny body while living alongside fluffy, magical beasts! (Sana Scans)