Sekai de Ichiban Hayai haru

Haruta Maho (Yoshida Mizuki) is a 26-year-old popular manga artist who was serializing the smash hit "Revive Line". However, at a manga award ceremony, she suddenly gives a shocking speech saying, "Revive Line is not something I created." During high school, Maho joins the manga club to draw her favorite manga, and there she meets her senior, Yukishima Shu (Fujiwara Itsuki). Inspired by Yukishima's passionate manga drawing, Maho also starts drawing manga. However, one day she receives a sudden phone call from Yukishima's younger sister, Sayaka (Ohara Azusa)... 10 years later, Maho has grown up with a certain "regret", but what is the true meaning of her shocking speech? And what is the secret hidden in "Revive Line"? Furthermore, after the award ceremony, Maho accidentally travels back in time to her high school days...!?

Haruta Maho (Yoshida Mizuki), a hit manga artist who gave a shocking speech at a manga award ceremony, sneaks into her alma mater and ends up traveling back in time to her high school days 10 years ago...! The day she traveled back in time was the day that Yukishima Shu (Fujiwara Itsuki), a senior in the manga club, first praised Maho's manga. Knowing that Yukishima has only a short time left to live, Maho uses the drawing skills she has cultivated over the past 10 years to assist Yukishima in drawing "Revive Line" as quickly as possible and having him see it published as a one-shot. Although the work is complete, Arashi Kagemasa (Okura Sorato) from the student council comes to the manga club room, and a new problem arises.

Haruta Maho (Yoshida Mizuki), a hit manga artist, time-travels back to her high school days. She tries to help her senior in the manga club, Yukishima (Fujiwara Itsuki), make his debut as a manga artist, but he collapses earlier than he remembers before the time-travel... As Maho sorts out the timeline to solve the mystery, she suddenly returns to September 1, 2015. In her second time-travel, she proactively solves all her previous mistakes, but Arashi (Okura Sorato), a member of the student council, sees Maho and becomes suspicious.

Haruta Maho (Yoshida Mizuki), a hugely successful manga artist, is in her third year of high school. While investigating the truth with student council member Arashi (Okura Sorato), who learned of Maho's time-traveling experiences, they begin to suspect that popular manga artist Gorilla Maruo (Mikata Ryosuke) may have also traveled through time. Meanwhile, Gorilla Maruo suddenly appears in the manga club... Meanwhile, Yukishima-senpai (Fujiwara Itsuki) plans a training camp with the prize money from his debut work, and heads to the camp with Maho, Arashi, and his younger sister Sayaka (Ohara Azusa), but there Maho learns something new.

Haruta Maho (Yoshida Mizuki), a hugely successful manga artist, was enjoying her third year of high school. During a manga club hot springs retreat, she learns that Sayaka (Ohara Azusa) has also time-traveled, and learns new information about time-travel from Sayaka. It's about a world Maho doesn't know, and it also reveals a shocking truth about Yukishima-senpai (Fujiwara Itsuki). Sayaka says she wants to get away from time-traveling, but Arashi (Okura Sorato) feels uncomfortable with her words and ends up getting into a big fight with Maho. Then, Maho is called by Yukishima-senpai...

Hit manga artist Haruta Maho (Yoshida Mizuki) has experienced her fourth time slip. This time, Arashi (Okura Sorato) is also caught up in the incident, and she visits Yukishima-senpai's (Fujiwara Itsuki) house in search of the "setting notebook" that holds the key to the story. However, her younger sister Sayaka (Ohara Azusa) is nowhere to be found, and she surprisingly reveals that she is an only child. In pursuit of Sayaka's whereabouts, the two visit Gorilla Maruo (Mikata Ryosuke), a man who has also experienced time slipping, and the two reorganize the complicated, intertwined timeline. Maho grows increasingly anxious about the seemingly endless time slip and tries to get Yukishima-senpai to draw the manga for her, but...

Manga artist Haruta Maho (Yoshida Mizuki), in her fourth year of high school, begins drawing manga with Yukishima-senpai (Fujiwara Itsuki), but Maho makes her debut first. Meanwhile, unknown memories begin to resurface one after another within her. Meanwhile, Yukishima-senpai is suspicious of Maho's relationship with Arashi (Okura Sorato), but the two visit Gorilla Maruo (Mikata Ryosuke) in pursuit of the mystery of their time slip. There, the shocking truth surrounding Yukishima-senpai's death is revealed.

Manga artist Haruta Maho (Yoshida Mizuki) regains her memories from before the time slip. She learns from Gorilla Maruo (Mikata Ryosuke) that Yukishima-senpai (Fujiwara Itsuki) was Maho's fiance, and that his death was not a suicide. Arashi (Okura Sorato), who believes that Sayaka (Ohara Azusa) may have been involved in Yukishima-senpai's death, plans to track down the real culprit, but ends up learning about Sayaka's tragic past... After learning the connection between the beginning of the time slip and the setting notebook, Maho reorganizes the complicated timeline and arrives at a certain conclusion. What is that conclusion?

After learning the truth about Yukishima's death, he tears up his setting notebook, and the fifth September 1, 2015, begins. Manga artist Haruta Maho (Yoshida Mizuki) chooses a path where the two never meet, so that Yukishima can continue drawing his manga alone. Meanwhile, with Yukishima's memory reset, Arashi (Okura Sorato), Sayaka (Ohara Azusa), and Gorilla Maruo (Mikata Ryosuke) fully support Yukishima's debut as a manga artist and the serialization of "Revive Line." Then, in 2026, Yukishima's "Revive Line" finally comes to an end. At that time, Maho...