3.939 out of 5 from 46 votes
They both have same characters in it, written by same author and art is the same. Endou-kun no Jikken Note; It's like a side story small piece of events so you could like it if you've read Endou-kun no jikken note. And even if you liked Endou-kun no Jikken Note without reading you could like the other one because you'll get to know characters and like this :)...
This manga is connected to "Endou-kun no Kansatsu Nikki" so you will like it if you've read it. But if you've liked it even without knowing the real story you could like the main manga. Both of them has same story telling way in it so you could feel the same atmosphere when you read the other.