I really sympathize with Keichi in this arc. It’s bittersweet to come to the end of an major era, and it’s scary to imagine being “an adult” so suddenly (little do you know at this age that adults don’t actually know what they’re doing either...). You’re foundering and worried that you don’t have all the answers, and that your future is dependent on you making correct decisions NOW. It feels like everyone else just has their stuff together and knows where they’re going, and you feel left behind and as if something must be wrong with you. Ironically, the normally overly worried Nacchan had the least amount of angst here - still waters run deep in Keichi and Tsuyoshi.