Shōhei Kodera/Plot

Background
During the Large-Scale Invasion, his house was destroyed by a Trion Warrior.

Introduction Arc
Kodera hides in buildings alongside Narasaka near Yumite District Station in order to provide support for Miwa Unit by sniping Yūma, should he jump into the air. Narasaka is eventually talked out of this by Jin. After the event, Jin is seen leading Kodera and his mentor out to confront the others.

Black Trigger Capture Arc
He and Yoneya have been observing Yūma's habits (though Kodera does all the work). During the battle, he provides support by sniping Jin, though all of his attacks fail because of the latter's foresight.

Large-Scale Invasion Arc
During Midorikawa's 1.v.1. with Lamvanein, he remember's Yoneya quoting Kodera following his loss against Yūma. He repeats the line to his opponent. Later Kodera makes an actual appearance (along with Narasaka and Tōma) supporting Izumi from long-range against Hairein and successfully hitting him through the spaces between Alektor's conjured birds. Mira later interrupts them by summoning Rabbits to attack them.

After the battle, Usami tells Osamu that the three aforementioned snipers revceived an Excellent Distinguished Services award from Border for their contributions.

B-Rank Rank Battles Arc
During Round 2's Middle Group Nigh Division battle, he offers impromptu commentary as an audience member.

He is among the group of Snipers sent to deal with the wave of Idras during the Galopoula Invasion. Along with his unit, he watches the live commentary for the night session of B-rank Wars' Round 8.

Expedition Selection Exam Arc
Kodera is chosen as one of eleven temporary captains for the test, leading four others in his care; Rokuta, Okudera, Miura, and Kitora. When explaining his picks for the latter three, he admits to prioritizing mobility and trion efficiency for this line-up. Shortly after, his team begins investigating available data aboard the capsule environment. Partly due to Kodera placing a time limit on his team for the completion of the first special assignment, his team (Squad 5) is the quickest to complete the most assignments. At the end of Phase 1's first day, they are graded as 2nd place.