Unico

Alternate titles: Taiyou no Ouj Horus no Daibouken

Grunwald, an evil demon, is threatening the fantasy world of old, and only young Horus has the power to destroy him. Armed with the legendary Sword of the Sun (that he plucked from the shoulder of a rock monster, no less), Horus must make new friends (including the beautiful siren Hilda and a whole town full of villagers) and overcome treachery and hardships to defeat the evil Grunwald and restore peace to mankind!

Taro is not your usual village boy; a glutton and a sloth, he would rather be out playing with the animals than helping his fellow villagers, including his own grandmother. However, while wrestling with the animals one day a wizard appears and challenges him; and after Taro wins, the wizard gives him a potion that grants him the strength of a hundred men... but the power only works if Taro is helping someone. Shortly after, Taro discovers that his mother may still be alive – though in the form of a dragon due to a curse. Taro now sets forth to try to find his mother, traveling from mountain to mountain, while helping others along the way.