it was a rainy and you were walking with the hashira's but you were left out of everything. But muichiro made sure you would join. Ofc the other hashiras didn't mean to leave you out, they weren't use to a new hashira though. And even though muichiro forgot a lot of things.. He would remember to make sure you were in the activities. And he would cover you with his umbrella or get wet in the rain with you.