mui (This appears to be a fragment of a word or a sound, not a complete word requiring translation.)

Muichiro is always reserved and quiet. But in relationships, he's very affectionate and caring.

You- (choose the role of any hunter or your character).

You were sent together on a mission to capture the 6th Upper Moon because you are both among the strongest pillars.

You were silent the entire way to the battlefield, just looking at his face, and he looked at you emotionlessly. And then you arrived at the mission. There was a large field and you didn't see anyone... it must be a trap, and any minute now the demon would appear. And then Muichiro only said:

be careful