Lost Song tells the stories of the cheerful Rin and the reserved Finis, two songstresses who are capable of performing magical songs. Rin grew up in a remote village with her family and was taught to keep her power secret, while Finis lives and performs in the royal palace. Rin's happy and peaceful life is shattered after she saves an injured knight named Henry Leobort with her song of healing. She was seen by soldiers who proceeded to attack her village in hopes of capturing her. With nowhere else to go, she and her inventor brother Al begin a journey to the capital. Finis finds herself falling in love with Henry and, knowing that the greedy and spiteful Prince Lood Bernstein IV desires her, must hide their relationship. She wants to help people with her songs, but with war on the horizon, she worries that Lood will order her to cast her magic in the battlefield. Only time will tell how her destiny and Rin's will intersect, as the two of them struggle to find their paths.

Ren Homura has just moved back to his hometown of Kaminohara, but he isn't able to remember much about the time he spent there other than vague flashbacks. When he retrieves his cell phone which he had sent to a shop for repairs, he finds that a mysterious game titled “Monster Strike” has been installed on it. Unaware of its purpose or how it got there, Ren decides to open it, an action that will change his life forever as he finds himself suddenly attacked by a strange man. Now trapped on the roof of his school which strangely has been designated as a stage, Ren is shocked to see the man summon a realistic monster from the game, one that is more than capable of inflicting damage on a human. His only chance of getting out of this situation alive is by summoning the dragon Oragon, who tells Ren that he will crush the opposing monster for him. Unfortunately, it turns out that Oragon is a tiny dragon that is completely useless!

After spending his summer racing against some of the best racers in Gunma, Takumi Fujiwara receives a formal challenge from the leader of the Akagi Red Suns, Ryousuke Takahashi. Despite his initial reluctance to get into the hobby, Takumi cannot help but feel excited to go up against the former White Comet of Akagi. In preparation for the battle, Ryousuke downgrades his car, putting his pride and racing career at stake. With the title of the fastest racer in all of Gunma on the line, will Takumi and his panda-colored Toyota AE86 be able to defeat Ryousuke's Mazda RX-7 FC?

One foggy morning, a black and white Toyota AE86 flies past Keisuke Takahashi's Mazda RX7 on Mount Akina, making him believe he has seen the ghost of a racer who died on the mountain. Resolving to defeat this phantom, Keisuke mobilizes the Akagi Red Suns to take on the local Akina Speed Stars racing team in an exchange race. He anticipates that the competition will lure the elusive Ghost of Akina out into the open and give him the opportunity to exact revenge for his previous defeat. While his friend Itsuki Takeuchi is obsessed with cars and racing, Takumi Fujiwara is not. He fails to understand the rush that racers experience and any talk of cars reminds him of the tofu deliveries he makes for his father in an old AE86. His early morning routine takes him up and down Mount Akina, where he has memorized every hairpin, brake point, and turn better than anyone else. When the Akagi team appears one night to challenge the Speed Stars to an exchange race, they accept the challenge only to find out that they are completely outclassed. The only way the Speed Stars can stand a chance against them is if they can get the panda-colored AE86 to join their team. With a bit of coercion, Takumi takes the wheel of the AE86 and heads off to Mount Akina to defend the pride of all racers in Akina.