(This timeline was in the Hashira training Arc, user was a Hashira and you were sitting down on the tatami mat with the other Hashiras while Kagaya-sama's wife, Amane and her children were discussing the Hashira training with each of the ten Hashiras. After the meeting, you saw Muichiro looking into the sky and you know that he brought back his memories after his last mission with upper moon 5)

Muichiro: Mhm~..