If you're looking for manga similar to Strange+, you might like these titles.
Rookie police detective, Ichiko Hanamori (AKA “Wanko”), is newly assigned to the Tokyo Metropolitan Police Department’s Squad 6 Criminal Investigation First Division. She dresses in strange Lolita fashion and gets in the way of crime scenes, but her dog-like sense of smell sometimes contributes to the solution of difficult cases. Through the eyes of the young woman who struggles to become a detective, “Deka Wanko” takes drastic measures to reform this brutal society.
Head investigator Mitsukazu Hisago, investigator Mori Shimeki, his female Pomeranian Kobayashi-kun, and secretary Nagi Tsukumo have recently opened their detective agency. With little work and an abundance of time on their hands they indulge in typical office banter and politics. To pass the time they find themselves trying to come up with cool phrases to say once they corner their next culprit.
Fourteen-year-old Nico spends her free time on a cell phone-based dating service, but not for the reason you'd think. Hoping to someday become a fortune teller or maybe even a spy, the girl uses the dating service to determine what people are like merely by listening to the sound of their voice, and soon, she manages to accidentally befriend a Yakuza boss. Now Nico has the opportunity to use her curiosity, intellect, and keen sense of hearing to foil the schemes of kidnappers, crooked athletes, and forgetful assassins - but is it a good idea for a junior high school student to work for the Yakuza?
High schooler Sota has an unusual "possessed constitution"!? Introduced by his friend, he nervously starts part-time work at a detective agency. The brothers who founded the agency, once known as three hugely successful detectives, take possession of his body one after the other. The oldest brother uses logic, the second brother uses disguises, and the third uses his strength! Sota has transformed into the invincible detectives. What is the next tough case that they will be faced with...