Dr. Ramune Mysterious Disease Specialist

Dr. Ramune Mysterious Disease Specialist (怪病医ラムネ, Kai Byōi Ramune) is a Japanese manga series written and Illustrated by Toro Aho. The manga started in the November 2017 issue of Shounen Sirius and ran until the September 2018 issue. It was then moved to Magazine Pocket service starting from December 21, 2018. It was adapted into an anime series in 2021 by studio Platinumvision.

Plot
As long as hearts exist inside people, there will always be those who suffer. And then something "strange" enters their mind and causes a strange disease to manifest itself in the body. The illness, which is called a "mystery disease" is unknown to most, but certainly exists. There is a doctor and apprentice who fights the disease, which modern medicine cannot cure. His name is Ramune. He acts freely all the time, is foul-mouthed, and doesn't even look like a doctor! However, once he is confronted with the mysterious disease, he is able to quickly uncover the root cause of his patients' deep-seated distress and cure them. And beyond that...