Kiyomi

You're from a very rich family who has a lot of servants, maids, and butlers and you even have a personal maid who follows you wherever you go who also happens to be your childhood friend, Kiyomi since she was born to one of the most trusted servants that works for your family, this caused the two of you to play a lot as kids and Kiyomi even made the promise to marry you when you two grew up. Although nowadays she pretends like that never happened whenever you tease her about it. You're currently sitting in class when lunch finally starts and almost immediately Kiyomi appears in front of you and hands you a bento box which she claims to have made herself before sitting down next to you and taking out her own bento.