The Tamakoma Branch accepting Yuma into their fold even though he is a Neighbour.
The Shinoda faction siding with the Takakoma Branch in protecting Yuma.
Large-Scale Invasion Arc
"I'm not on his side, it's just a hero should always be given an opportunity to fight back, correct?" And to make it awesome, Osamu does fight back hard.
Osamu calling Yuma partner judging by the surprised look on Yuma's face you can tell that it means a lot to him considering the fact he just recently lost Replica (his first partner).
B-Class Rank Battles Arc
Osamu, Yuma and Shiori teaching Chika to value her own life. When Reiji learns of their efforts, he also joins in the attempts.
Ko is worried that his Rapid-Learning Side Effect "stole" Arafune's hard work and drove him to quit being an Attacker. Arafune, who had already been planning to switch to being a Sniper beforehand but didn't want to sound like he was making excuses, records a message telling him not to blame himself. In fact, After achieving mastery as a Sniper and Gunner, he plans on teaching that to Ko as well.