Master Keaton (1998) IMDb
Imagine Indiana Jones or Tintin reborn as half Japanese and working as an insurance claims investigator in the 1990s.
Mostly a family TV adventure, but with occasional blood. As far as I know the OVA is just more of the same. Canon Gary Stu and highly episodic structure. Some of the writing is boringly transparent or stupid, some of it nice. Kawajiri Yoshiaki has screenwriting and storyboarding credits but only on episode 34.