Detectives These Days Are Crazy! Vol. 2 - Masakuni Igarashi

Keiichiro Nagumo may have been a super great detective at one point, but now that he''s in his thirties, he''s just some dude. Appearing before this outmoded private eye is Mashiro, a high school girl brimming with youth, and the pair tackles cases together as they contemplate their generation gap. Until one day, a rival (?!) detective comes to them with an SOS.