Hotaru's Way Vol. 13 (Kodansha, 2020)

Who knew guys had such a hard time forgetting their exes?! At long last, Hotaru realizes she has feelings for Takano and makes up her mind to try and win him over. But before she can make the first move, Buchou's ex-wife, Miyuki, turns up...and he flies all the way to Okinawa just to be with her! After a little pep talk from her old rival, Aoi, Hotaru decides she's not going to take this lying down...and books a flight to Okinawa herself. But she never could have guessed who was waiting for her there...!