Mc is retarded has 0 Iq and Eq his "sad" backstory is just him being bad at school even though for normal person this is imposible as long as you pay attention its not like he is in med school just normal high and the reason author gave is that his sister is genius so when he was young he wanted to help her and started to learn retarded sh*t and as expect beacuse of that his parents said he was mistake and now mc just gave up on his life and didnt try to improve how he got in high is miracle cause it seems he doesnt even do anything so his backstory is all his fault and he blames world for something he can fix easily. Story is normal revenge story in japanese isekai setting 5 people summoned 4 heroes mc isnt you can guess what happens no need to read after that princess travels with rank 3 when her father is rank7 and can get rank6 guard and suprise she is almost killed by 2 rank3 orcs and another suprise rank3 are ants trash and there are millions of them stupid, read rewiew for more.