A bunch of love letters. Hizashi wrote them in English to Aizawa knowing Aizawa wouldn't be able to read them. Hizashi was recently killed by a villain and Aizawa is emptying out the house of Hizashi's things and he finds these letters. He decides to try translating them. It's difficult, and he can't make sense of most of them, but he tries.
I know what it feels like now. That deep, endless pit people feel inside of them. The pit that's created when your heartbroken, or maybe even lovestruck. I don't know much about it but I know I hate it. I hate it so much,