Nervous Breakdown

Ando Ichi, the son of a pharmacist , is a bespectacled, handsome man who loves women. He uses his good looks to charm one woman after another. On the other hand, he is extremely sickly, especially with a weak stomach, and frequently vomits. However, he possesses an intellect that even police officers respect. Ando's partner, Miwa Seigo, is a mountain climbing specialist, rally driver, and tropical fish breeder , a tough guy with great physical strength. On the other hand, he is not very intelligent. Ando and Miwa, childhood friends who attended the same university, later join the Tanuma Heikuro Detective Agency . Heikuro is a former police officer and has connections in the police world, but he is a complete slacker. His daughter, Tanuma Kyoko, who is in charge of accounting , is a shrewd operator with talent as a hacker. Her shrewdness with money is what keeps the small agency afloat. Furthermore, she had been helped by Ando's brilliant deductions in a past incident, when he was just an ordinary college student, and although she was fed up with his womanizing, she secretly admired him.
One day, Ando receives a request from Miya Inaba, the daughter of a wealthy family, and solves the case with brilliant deduction. Miya is completely smitten with Ando and forces her way into becoming a member of his firm. Thus, the detective agency, run by director Heikuro and his four subordinates, begins its activities in earnest, and the rivalry between Kyoko and Miya also begins.
Meanwhile, a new case arises, triggered by a case that Heikuro had handled in the past. Iwakiri, Heikuro's junior and a current detective in the First Investigation Division, also makes an appearance. The case is solved by Ando's brilliant deduction, but Heikuro, feeling his physical decline after being hospitalized, decides to retire. Ando marries Kyoko and effectively takes over the firm. Ando, ​​having earned Iwakiri's respect, also begins cooperating with police investigations (though Kyoko complains that it doesn't bring in any money).

Note: Chapter 89 is newly drawn for the physical only Paperback edition of vol 9