Was Natsuki's first love, Atri? His beautiful childhood memories are gradually being overwritten. Despite his unwillingness to admit it was her the facts around him are lining up to force him to, but he continues to deny it.

Natsuki's life experiences a big shift after becoming a teacher and starting a salvaging service. Rumors of a school lit with electricity attracts new students, and activities around the school regain a sense of liveliness.

If Natsuki sells Atri, he can get batteries. However, he can no longer think of Atri as just an average humanoid. While he's deep in thought on the dock, looking out at the ocean, Natsuki finds Catherine floating in the water. She is completely intoxicated, and Natsuki and Atri take her in. But right at that time, the sound of a gunshot echoes within the silent ship.

Natsuki sets his heart on creating a tidal power generator that utilizes the ebb and flow of the ocean's tides. He dives back into the ocean to find some materials and salvages some resin from the ruins of Ryuuji's family's factory. As soon as he gets back he gets to work. As they are working, Natsuki and Ryuuji exchange heated opinions over how the generator should be built. Atri intervenes and the two guys become closer friends. Meanwhile, a suspicious-looking character peeks at them from outside of the school....

Natsuki accompanies Atri who is on her way to school. However, when they arrive, they find that most of the school is underwater. Although they managed to get into the school building, inside it was full of empty classrooms and an unexpected teacher. There, Natsuki is faced with the saddening reality of the lives of the people who remained in their town.

"I'll be your leg, Master!" Atri, who was supposed to be with Cathrine, has come back to Natsuki. Although she was pumped to be of assistance to her new master, she fell into the ocean while carrying him and failed at cooking… It's as if she is a piece of scrap. Atri seems to have received a very important order from Nonko and tries to remember what it is, but...

Only three days remain. Atri decides to become a part of Eden's system, and the clock ticks on for Natsuki who decides to spend his life looking for a way to save Atri.

Atri's last order that was given to her by the capsule was to go to Eden. However, Natsuki and the rest are perplexed by the incomplete set of instructions and don’t know where to even start looking.

Natsuki decides to head back to the Academy on the mainland to study humanoids. He decides to leave the salvaging service in Ryuuji's hands, and while he’s tidying up the ship in order to pass it on to him.

When Natsuki comes to the rescue for the now-beaten-up Atri, he becomes the next target of Yasuda’s acts of violence. With the onslaught of consecutive attacks, he finds himself also beaten up, just like Atri. Before Yasuda can inflict any more pain, Atri, unable to tolerate watching any longer, raises her fist against a human once more.

In the near future, much of the world has been forgotten at the bottom of the ocean due to rising sea levels. Natsuki Ikaruga, who lives in a small town surrounded and stranded by the sea, is invited by a mysterious woman, Catherine, to search for a treasure in his grandmother's house who was a marine geologist. One day, he dives to the bottom of the ocean in a submarine and encounters a mysterious capsule with a girl sleeping inside. The girl was a humanoid so sophisticated that she could be mistaken for a human.

The next stop on the calendar is Shanghai, a race that offers the unique challenge of being run at night. Rin adjusts to her new set of wheels immediately and qualifies well, but can she turn her high grid position into a podium finish or even a win?

After crashing out in her last race, it's back to the drawing board for Rin and her crew. While her mechanic and her car's AI, ami, work out how to give her a car setup she can make the most of, Rin tries to get to grips with a 1960s grand tourer.

Rin Rindo returns from the summer break with her thoughts firmly on improving on her results from the first half of the season. Will a sudden downpour mid-race provide her with a golden opportunity?

It's finally the summer break, marking the halfway point of the season, but if Rin and her fellow drivers thought they could spend the time relaxing, they have another thing coming.

The NEX Race drivers descend on Monaco to do battle on its narrow, twisty streets. Rin makes it onto the starting grid after failing to do so at the two previous events, but can she keep it out of the barriers and prove she belongs in this series?

Attending gala events and Q&A sessions is part and parcel of being a racing driver, but when Rin is a no-show at one such event, her fellow drivers wonder where she might be. Curiouser still is the fact that the King is also missing...

After her first race in the category ended in disqualification, it's clear to Rin that she has a lot to learn if she wants to compete with the big guns in the NEX Race series.

It's the first race of a new season, and rookie Rin Rindo is looking to make an impression in her first ever race, but she quickly finds out that racing cars in real life isn't quite the same as competing in a video game.

Rin and the King duke it out for the victory at the final race. Can Rin get the win and secure her future in motorsport?