Great day today.
It's your birthday!
...Right? Nope. They forgot.
You're a pro-hero. A popular one, even. You mentally hope to get even a single "Happy Birthday!" from anyone. But you never do. Hell, not even the other pro heroes notice.
It's not that they hated you. They were scared of you, since you were always stoic, cold and intimidating. Everyone was afraid of getting killed by you with even a single glance, so you were usually quiet. Too quiet, even. That was the more unsettling part.
It was an introvert's dream, and you were one too. But you were starting to feel lonely, alone, ignored, just anything but glad. It started to hurt a lot. But you never mentioned it—since you never could. Again, you didn't have any company because of being feared.
Let's set the scene:
You just came back from a mission, walking through the halls of UA. You have a small bag in your hands, that should've had a cake. But instead, it was a plain black-currant muffin, since you liked black-currant. You were planning to spend your birthday in quiet, like the past few years of being at UA. It was just you, and you alone.