Attack Detective Armin

Attack Detective Armin (進撃たんていアルミン) is a children's puzzles book written by Yuuji Chari and illustrated by Lariat, based on the original manga by Hajime Isayama.

Synopsis
Have you ever seen Titans? They have huge bodies which are a nuisance to humans. But don't worry, the Attack Detective Corps is full of professionals qualified to defeat those Titans! Armin, who loves to deal with mysteries and incidents, will take the entrance exam with his friends Eren and Mikasa! Can you pass it safely? This "Attack Adventure Book" is finally out!