35-leukothea:

fun fact about this scene! in the anime at least, the verb that they both use to say “I promise” or “I swear it” is not 約束する, which is a common verb for “to promise;” instead, they use the verb 誓う, which is less common, has a more serious tone, and is most frequently used in WEDDING VOWS.

this has been a nezushi psa.