Kudou

Saybil is a magic student with no memories of his life before he met a mysterious silver-haired woman in an alley. Now he travels with his teacher, Loux—another student, Holt, and the beastman Kudou for "special training"... but this field trip may not be as routine as it seems! Source: Kodansha

Sae has always been taller and stronger than the average girl. Kouki used to be smaller and weaker than the average boy. But now that he's in high school, he's tall and super popular! Will their childhood friendship rekindle...and maybe develop into something more? Source: Viz