Momoko Tanteichou

The story is a suspenseful action drama in which the three good friends Momoko, Kijiko and Wanko (Ribon Tanteidan) encounter bizarre incidents involving monsters and monstrosities such as ogres, sea monsters, kappas and wolf boys, and solve them with intelligent reasoning and courageous action.

(Source: Fukkan dot com, translated)

Note: This manga received its first tankoubon release in 2014, more than 60 years after its original publication in Ribon