Iroha saved Yachiyo from being mind controlled by the shrine. Also she saved Yachiyo again by giving a grief seed. Well, you know Iroha-chan.. if a girl let's you stay at her house and cook for you, then you already have her respect.
They did not even thank Mami! ><
well, if Mami tried to attack the unconscious Iroha.. there would have been a battle for sure. Yachiyo would not allow her waifu to be killed while sleeping.
