Doctor Haruma Takaie is a critical care doctor at Daida General Hospital. One day, 2 patients comes in, both with heart attacks and both with a swollen eye. Both of them die within minutes of each other. He suspects it’s Chagas disease, caused by parasites, but his medical director dismisses this theory. Takaie’s strong moral compass leads him to file a complaint anonymously to the government. Tomoe Makino is an overachieving government worker who’s been relocated from the Ministry of Foreign Affairs to the small group called Science Medical Responders Office. She vows to prove herself in less than 2 years, move back to the Ministry of Foreign Affairs, and get a promotion. Her first assignment, however, is to handle the anonymous complaint filed against Daida General Hospital. And finally, we have Professor Tetsu Himokura who is a parasitologists. He runs his own laboratory, complete with a conservatory called “Himokura Tropical Plant Garden”. He turns out to be a weird, anti-social, mad scientist with a robotic arm. Three of them finds a way to stop fighting among themselves and start fighting to get to the bottom of this medical mystery case. Along the way, they find themselves picking a fight with the system–the government.