The Familiar of Zero

The Familiar of Zero is a light novel series that received an anime adaptation which aired for four seasons from 2006 to 2012.

The story follows the adventures of Louise and Saito, a student and her familiar at the Tristain Academy of Magic for aristocrat magicians. Louise is a person who is so terrible at magic that she's nicknamed "Louise the Zero" by her classmates, to the extent that while taking part in a ritual to summon a familiar, Louise summons Saito Hiraga, an ordinary Japanese teenager from Earth instead of the usual magical creature like every other student had summoned.

OP
Saito takes a bath.

Episode 2
Saito is injured.

Episode 8
Saito takes a bath.

Episode 9
Louise gives Saito a sweater to wear.