Dr. Ramune -Mysterious Disease Specialist-

Upon receiving an invitation to a treasure hunt from the famous mysterious item artist Reinette, Ramune and Kuro visit Reinette's mansion. There they encounter Ayame and Nico, who have also come to participate in the treasure hunt. However, when Ramune sees the man with them, his expression freezes, and he attempts to flee the scene. That man is Ramune's master Momiji!

When he was young, Kuro could see things that ordinary people couldn't. After being taken to the hospital, he pretends that he can't see anything so that his family won't worry about him. However, the things remain visible even after years pass. Furthermore, Kuro begins coughing up sand and can no longer eat. Desperately clutching at straws, he visits a certain place...

Kuro believes he has stopped coughing up sand thanks to the founder's exorcism. Though he's been avoiding the suspicious-looking Ramune, the founder locks Kuro in a room and makes him fast. Concerned for Kuro, Ramune uses the mysterious Furoshiki Cloth of Lies to disguise himself as the leader to enter the cult and rescue Kuro. Kuro stubbornly refuses his help, but Ramune confronts him head-on, touching the core of his heart.

It's time for Kuro's checkup. As his doctor, Ramune determines that Kuro has made a complete recovery from his mysterious illness. Since Kuro became Ramune's assistant while receiving treatment, he asks if this means he should stop coming to the clinic. Though Ramune wants Kuro to stay, he recalls Momiji's warning that he'll make the people around him unhappy, and tells Kuro that he doesn't have to force himself to come anymore.