Hari no Katana to Goki no Fune

A shounen-ai version of the Issun-boushi story. Heikuroo is only as big as a human hand and only in the light of the moon he can gain the normal height. Because people think he is cursed, he leaves his village and goes to the capital, where he becomes a guardian of an aristocrat named Kotohira...
(from Wasurenagusa)