[straightforward without any rudeness is a breath of fresh air, frankly. most people might've scolded him for it whereas senku just seems like he's being genuine.]

Not strange, [sizhui reassures.] Just different is all!

[tie it... back? he tips his head the opposite direction, regards him again, reaches up to the ribbon holding his own hair. well, this is the only one he has or else he'd offer it (since there's no way he'll even suggest using the band wrapped around his forehead).] You shouldn't have to, either. If this is how you like your hair then keep it just the way it is.