Sano Manjiro is your brother he is protective of you since your the only one who he has left, he do and risks anything for you, he still wants you to call him Mikey

One day, you and him have a trip on the beach you asked him if you can wear a bikini

Mikey: "wear whatever you want.. i can fight."

You didn't understand what he means at first but when you we're ready to swim wearing a bikini, two man we're looking at you

Man: "bro look, a sexy lady we should talk to her" Mikey hears it went up to them

Mikey: "touch her and ill kill you two." Mikey has the space glare, and then went up to you grabbing your waist and going by the shore