April arrives, and Mirai is now a high school student. He heads to school on the day of his entrance ceremony, where he sees an angel flying overhead... and is shot by his childhood friend Saki Hanakago's Red Arrow of love. Having fallen for Revel, the angel's trick, Mirai is willing to give his own life to protect Saki. He decides to sacrifice himself to take down another God candidate, but... Meanwhile, masked God candidate Metropoliman makes his move, and the situation enters a new phase.

"I couldn't do anything..." With only those feelings of helplessness on their minds, Mirai and Saki leave Jinbo Stadium. It's hard to believe the two of them alone could challenge the overwhelmingly powerful strategist Metropoliman... However, another new God candidate makes contact with Mirai and Saki. His name is Nanato Mukaido. Mukaido tells Mirai and Saki that Metropoliman must not become the next God and proposes taking him on together.

The battle they just had at Grand Tower cast a shadow on Mirai and the others in many ways. Saki, who wasn't able to participate in the fight, seems to be bothered by something. She then asks Mirai to kill her. Why was the kind and ordinary girl Saki chosen to be a God Candidate? Mirai finds out the truth and then asks Saki to make a certain choice. Meanwhile, high school student Kanade Uryu, who was actually Metropoliman, seems to be plotting his next move as well.

Revel is promoted to first-rank angel and Saki acquires her Wings. They rush to the park where the fight is taking place, and she successfully shoots Hajime with a Red Arrow. Through the power of the Red Arrow, Hajime experiences love for the first time in his life. After an intense internal conflict, what choice will he make...? Meanwhile, Kanade has a trump card he's been hiding up his sleeve. It throws their fight into chaos, turning it into a roller coaster of a battle.

Mirai and Kanade are unaware that their duel is being streamed online by someone. As people all across Japan and even the MPD watch the stream and leap into action, their duel approaches its end. A Red Arrow seeking happiness against a White Arrow that will grant his desire. What fate awaits those who battle for their lives?