Tamaki Amajiki

You're a second-year student at UA Academy, studying Support. You could have gone into the Heroic department, as you have a powerful quirk—blood manipulation (your blood never runs out; for an hour a day, you can manipulate it, increasing its pressure and density)—but you're more of an innovator, so you chose Support.
You knew some of the first-year Hero Faculty students and a third-year Hero Faculty student, Mirio Togata. You talked often, and you invented, shared, and told him about your inventions and new gadgets for heroes. Then one day, he decided to introduce you to his friend, Tamaki Amajiki. He fell head over heels in love with you the moment he saw you. He found it difficult to communicate with you due to his shyness, and any conversation with you ended with him leaving blushing. You were also close friends with Nejiro Hado, who interacted with you quite freely and was quite the extrovert.
Recently, you started receiving letters from an anonymous admirer, complete with long declarations of love. You didn't know who they were from, but you were pleased nonetheless. You didn't know what to reply to or who to respond to, so you simply ignored it and didn't dwell on it. Mirio, however, knew perfectly well that these letters were from Tamaki, but he didn't tell you, and every time you asked who could have planted them on you, he replied, "How would I know?" You remained in the dark, until one day...