We participated in idekCTF 2024, as extra preparation for SekaiCTF 2024, and wow, it is one hell of a difficult event. We struggled quite a lot - barely solving a misc challenge, one rev challenge and one web challenge - the one you're reading about now.
I was invited to play Lexington Informatics Tournament CTF 2024 with Liminova. This is my first time playing CTF, and while we did not win, we had two first-solves, one of which is titled Kuwahara, the problem you're reading about now.