Aichi re-enrolls in Miyaji Academy with Misaki. However, when he settles into his old school again, it becomes apparent that his hobby has little place in a school where the primary concern is college. At the end of school, he goes to Card Capital and a regular student, Naoki Ishida, follows him. Aichi teaches him how to play Vanguard, and introduces his new deck. Although Aichi wins, he notices that Naoki bought a Trial Deck, which means he is now interested in Vanguard. He then decides to keep an eye on him.
He tries to start a Cardfight Club at his school, but many people only wanted to join because Kourin was a member, so it resulted in there only being three Members so far, being Naoki Ishida, Kourin Tatsunagi, and Aichi. In addition, the student council, who disaproves the formation of such a club, frequently spred rumors and a bounty on the Cardfight Club to dismantle them. Eventually they add Shingo Komoi and Misaki Tokura competing the Cardfight Club but was not approved as they also do not have a teacher to advise them. As an alternative, The Student Council President challenges them to face Hisui High's Cardfight Club rewarding them with aproval and an advisor should they win. By the time Aichi fights, the results are tied up leaving it up to Aichi to save the Cardfight Club. He faces off against Morikawa whose deck was switched out in favor of Kai's Kagero deck which utilized Dragonic Overlord The End and the Kagero's new Break Ride as a way for Kai to test him. Aichi manages to break through impressing even Kai with how strong he has become. This victory establishes the Cardfight Club within Miyaji Academy as Aichi is named President and Captain of the club.
During the regionals for the High School VF Circuit, his team begins the tournament defeating Hisui High with Aichi coming out victorious against a strong willed Izaki. By the finals, Aichi faces off against Ren to decide the fate of both schools but in the end, Aichi fails to defeat Ren and knocks them out of the next stage of the Circuit.
He returns to his duties as club president only to find himself getting a strange premonition about his friends. Soon he faces against Naoki who is being controlled by Link Joker defeats him. He also starts getting strange feelings as Kourin has not attended school for a while and Kai has not shown up to Card Capital as well.
Later on, he is shown to lead his club on a hike trip around the camp site that the whole academy is taking as a relaxing trip. He and his team made it first out of everyone and the other students are rather impressed at that. At night, the whole club gathered around to watch the high school cardfight tournamet, they were joined by other students along with the Football club and the Paranormal Research Society though Kourin was a no show. He with Naoki and Shingo made a vow to win the next tournament. The next day, he and the others worked together to enjoy their time on the trip. At night, Kourin asked Aichi to walk with her to the legendary tree next to the lake. When they reached there, Kourin told Aichi to fight her in a cardfight. Not wanting to disappoint her, he agreed to it while Miskai calmly watched from a far. During the fight, she displayed a sign of being Reversed, however, at the last minute, she was able to break free of it. She, then, ran off without a word while Aichi and Misaki wondered what was happening. When on the bus back to school, he wondered and worried for what is happening to Kourin. When Aichi returned to Miyaji High School, he felt bad premonitions during the bus ride back and immediately ran out only to find Kamui who was just defeated by Kourin and in the process of getting Reversed and the Student Council Secretary, Maki Nagashiro, showing a video of the Reversed Takuto who declared it to be the beginning of the destruction of the world.
Upon returning to Card Capital, Miwa shows himself and reveals that Kai has been reversed all for the sake of facing Aichi. Soon after Miwa leaves, he is confronted by Leon who plans on facing Kai and Takuto. He challenges Aichi for the sake of seeing if both are prepared for the threat but after Aichi rides Blaster Blade Liberator, Leon suddenly stops the Cardfight stating that Aichi is hesitating to fight Kai saying that the strong wind from when he usually brings out Blaster Blade isn't there. Aichi realizes this hesitation and reflects on his doubts. Soon he hears of Naoki and Shingo missing for a day realizing that the both of them are attempting to liberate Miyaji Academy. When Aichi and Misaki head over, they find that the black ring hovering over the school is disappearing. As they find an exhausted Shingo and Naoki, Naoki having just defeated Maki, Shingo revealed that Naoki decided to take on all of these cardfighters for Aichi. Inspired by Naoki's passion and courage, Aichi decides to storm the Tatsunagi Corporation with the intent to defeat Kamui, Kai, Takuto and whoever else stands in his way in defeating the Link Joker.
Upon making his way there with Misaki, Naoki and Shingo, he encounters Kamui who challenges him. Kamui reminds him that when they formed Team Q4, Aichi was barely keeping up against Kamui, slowly becoming equals but soon enough, it became obvious that Aichi became much stronger than Kamui. Kamui manages to get his Crossbreak Ride off with Ethics Buster Reverse delivering a full eight attacks but combined with a couple Quintet Walls and a strong guard, he holds out stating that it's through the bonds of Q4 that he was able to get as far as he is now and that Kamui is one of his strongest rivals. He solidifies this by Crossbreak Riding Gancelot Zenith and after superior calling Blaster Blade Liberator, defeats Kamui and returns him to normal as he now is accompanying the group. He watches the Misaki's fight against Miwa and ultimately ends up fighting Kai as well. Confident that he can bring back Kai, he does well against Link Joker for the first time. However, Aichi fails to defeat him as Kai ends the fight by break riding Star Vader, Chaos Breaker Dragon and breaking Aichi's Quintet Wall. Upon being defeated, Aichi would have ended up being Reversed, prolonging the process through his own willpower, but Leon with Sharlene and Jillian luckily came in time with a mirror holding Takuto, who helps Aichi tap into his Psyqualia to temporarily suppressing the Reverse process. However, the strain of holding back such a power has affected him as Aichi cannot engage in a cardfight otherwise the power would rush out all at once and would threaten his life, thus benching him for the time being.