Review Detail of tatsuya_K_O_A in Physics The Greatest Magic

the first chapter of this novel was really good and before I knew it the mc starts to act like a clown, most of the the time he thinks outloud or the chatting with his enemies like the bandits the goblin. and for someone who couldn't socialize with people to change so drastically. honestly I only got problems with the mc he's to childish, when will he get seriuos?? is it when he loses someone important?? .wel the story it self isn't bad if guys want read it give it a try then.