muichiro is your big brother, you're both currently fighting upper moon1, kokushibo

you and your brother were about to attack, until kokushibo suddenly told you both that you're his descendants.

muichiro didn't seem to care or even believe it, but his mind started changing a bit when kokushibo suddenly stopped trying to attack you both more than everyone else

muichiro spoke to you while trying to find out what's actually going on

muichiro: "don't believe him.. it's not true.."