Kaiju No. 8

It has been a century in Japan where a giant beast known as Kaiju continuously caused damage to the people and destroyed many towns. The Japanese government decided to fight against that beast and stop him from causing damage to Japan for that sake, they established a special defense corps force that risked their lives to protect civilians. When they succeeded in killing the monster then a special team of sweepers went to that place to clean all the mess. Two boys, Kafka Hibino and Mina Ashiro both lost their loved ones and towns to Kaiju and wanted to become the part of defense force so they took revenge for it. Mina was lucky and soon got a high-ranked post in the defense corps at the age of 27 while Kafka was 32 and worked as the sweeper in the defense force. His dead desire to become an officer in the defense force again when Leno Ichikawa joins his team. Kafta was attacked by a small Kaiju and it entered his body.  He turned into a Kaiju but successfully ran from the place and they gave him the name Kaiju no.8. After that he tried to control it and applied for the military and got selected now he is a part of the defense corp and also fighting with its inner beast.