We all knew Fukuoka was a gay boy, but is Kitajima as well? We still have the original worldline where Kitajima deflects on Fukumen and Fukuoka doesn't say anything, we know Kitajima knows Fukuoka killed Nishida, and we know that Kitajima helped write the suicide note...My best guess at this point is that Kitajima knows Fukuoka likes him, and is just using him as a tool to help get and get rid of girls he's into? Or maybe he was panicked when Fukuoka killed Nishida and was worried it'd be pinned on him, so he agreed to cooperate with Fukuoka to cover up his crime?