As one of my personal favorite pairings in Hibike! Euphonium, I’m really glad to be able to work on a doujin focusing on both of them. I’m a fan of Yamaoka Yuri as well so it was a perfect match. –NinetyTwo
TL Note: NakaYoshikawa (なかよし川) is a combination of their names, Nakagawa and Yoshikawa, as well as wordplay on their names sharing the same kanji, “kawa (川)”.