World Trigger

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World Trigger also known in short form as WorTri , is a Japanese manga series written and illustrated by Daisuke Ashihara, and serialized in Weekly Shōnen Jump since February 2013. An anime adaptation of the series produced by Toei Animation started airing on 5 October 2014, with the series ending on April 3, 2016.

The story introduction start where, in Mikado City, a "gate" to a different world is opened suddenly one day. Monsters called "Neighbors" start appearing from it, everyone after the gate is opened for the first time, Yūma Kuga, a humanoid Neighbor, comes to Mikado City, where he meets Osamu Mikumo, a Border agent.

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 Osamu Mikumo is one of the five main characters in the manga and anime series World Trigger. He is a B-Rank Shooter and captain of Tamakoma Second.

Osamu is a very honest person, as noted by Yūma Kuga who has the ability to discern lies and is thus very trusting of Osamu. Osamu is very determined and courageous always going out of his way to help others even if it puts himself in harm's way. He has a strong sense of justice. It is implied by Jin that his reason for joining Border is to help others(in particular Chika). On the other hand, Tachikawa labelled him a ruthless individual, using crafty strategies to win battles.

Osamu knows he has limited talent for direct combat and that he is not nearly as proficient with his trigger as his teammates and other Border members. He recognizes his weakness and strives to become stronger.

Kazama's advice to fulfill his duties as a captain had an impact on Osamu since it allowed him to change his approach and make his team stronger rather than just focus on himself.This change in his thinking has allowed Osamu to think outside the box and strengthen his team by pursuing ideas such as deciding to add an additional member to his team,asking Jin to join his team,agreeing to allow a former hostile neighbor to be part of his team and finally using negotiation tactics such as controlling the flow of the conversation by implanting "agents" in a room,a tactic he learned from Eizo Netsuki when it was used against him in the press conference.

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Chika is the younger sister of Osamu's tutor, whom he promised that he would protect her, which is part of the reason why he joined Border. He was the only person whom she trusted after the disappearance of her friend and brother, and before she joined Border. He is always encouraging her, and she has a lot of trust on him too.

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Osamu acts as the voice of reason for Yūma, and teaches him about Earth's customs. Despite originally conflicting due to their different beliefs and upbringings, they grew to trust each other and become great friends with both willing to risk their lives to help each other.

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Jin saved Osamu from a Neighbor, after the latter tried to break into Border's HQ, and helped him join Border as a combatant. Jin is also one of the people who see potential in Osamu, always encouraging him to do his best. As a result, Osamu looks up to him.

This Osamu Mikumo, Chika, Yūma, and Jin isthe top four main characters in the World Trigger.

Give it a shoot and try to watch or read it, but i prefer to watch cause the thrilled is more.