Noire would've been the heir chosen to guard the sea, but narrowly missed out on the responsibility by being born a few minutes later. Thanks to that, he's enjoyed using his power but not being weighed down by the responsibility of the household.

Everyday, Noire sees his brother struggling with the weight of his responsibility and can't help feel guilty while he goes out to town. So, he started to distance himself from him and tries to be more independent.