The Eccentric Doctor of the Moon Flower Kingdom Vol. 5 by Tohru Himuka

At last, Koyou's practice is open and ready for patients, but business sure is slow! Bored to tears, she stumbles upon the perfect thing to lift her spirits - muscle erotica?! And while muscle-obsessed Koyou ransacks the capital for more, Keiun sets out east to the Plum Province to find out more about a strange illness...
Binding: Paperback / softback