Rin convinces Haru to confess to the person he loves, which leads to Haru kissing him and Rin being confused. I read this as one-sided love on Haru's part, and Rin being willing to go along with it in the moment for Haru's sake. It was bittersweet for me.
Rin is going to have a sleepover with Haru for the first time in 4 years after coming back from abroad. Another friend messed up Rin's imagination when he mentioned how much Haru likes Rin that it's pure and not friend-like. Rin decided to ask Haru who he likes and finds out after a hot mess!