Rascal Does Not Dream of a Dreaming Girl

Mai dies because she sacrifices herself to save Sakuta from a traffic accident on Christmas Eve. When Sakuta tries to sacrifice himself to give Shoko a chance at life, Mai pushes him out of the way at the last second and takes the impact of the car herself. Her heart then becomes the donor transplant that saves Shoko's life.

Earlier scenes show Mai's playful spirit and her deep love for Sakuta, foreshadowing her willingness to give everything for him.

In the original timeline, Sakuta is declared brain dead after a traffic accident on Christmas Eve. His heart is donated to Shoko, who was dying from a severe heart disease. This is why adult Shoko returns from the future - she owes her life to Sakuta's heart.

Sakuta notices mysterious injuries throughout the story that are actually connected to adult Shoko's existence.

The two versions of Shoko exist in different timelines. The middle school Shoko is the younger version suffering from her heart disease in the present. The adult Shoko is from the future, having already received her heart transplant and lived for years with Sakuta's heart before coming back to save him.

Sakuta's injuries worsen as adult Shoko's presence becomes more prominent, hinting at their temporal connection.

When Sakuta returns to Christmas Eve and prevents the accident by pushing his past self away from the car, both he and Mai survive. However, because Mai doesn't die, she doesn't become Shoko's heart donor. This means Shoko loses her chance at survival and will die from her heart disease.

Adult Shoko warned that changing the past would erase her existence in the present.

Young Shoko chooses to erase her memories of meeting Sakuta and Mai because she realizes her existence causes them pain. By creating a future where they never meet her, she believes they can be happy without the tragedies she brought. She writes down her hopes and accepts that she will die early, fading from existence.

Adult Shoko's deep love for Sakuta is revealed earlier, making her selfless sacrifice understandable.

Sakuta wears the pink rabbit costume when traveling back to Christmas Eve because only people who believe in his existence can see him - similar to how Mai could see the adolescent Shoko. The costume, which references Mai's playful personality, allows him to be visible so he can interact with others and stop the accident.

Earlier scenes establish that people with strong feelings or those in need can see manifestations in this world.

Sakuta decides to sacrifice himself after learning that adult Shoko came back to the past out of love for him, and that her feelings grew because he was her heart donor. Moved by her devotion and wanting to give her a chance to live, he attempts to replicate the original timeline's sacrifice by purposely getting hit by a car.

Sakuta's injuries throughout the story indicate his timeline is tied to Shoko's existence.

At the ending, time rewinds to when Shoko is in fourth grade. She writes a letter to her future self, choosing to forget her meetings with Sakuta and Mai to spare them pain. This creates a new timeline where they never meet her, leading to her early death. However, fragments of memory seem to persist, allowing Sakuta and the healthy young Shoko to recognize each other at the beach.

The time-loop mechanics are established earlier when adult Shoko explains she came from the future after receiving her transplant.

The beach scene shows Sakuta and Mai encountering a healthy young Shoko on New Year's Day, suggesting that despite Shoko erasing her memories and dying early in that timeline, some form of connection persists across alternate timelines. It hints at the possibility of love finding a way beyond time's barriers, though the nature of this meeting remains ambiguous.

The story establishes that memories and emotions can transcend time through the heart transplant and repeated time loops.

The story presents a tragic paradox: Shoko can only survive if she receives a heart transplant, and the only available donor in the original timeline is Sakuta (who dies) or Mai (who dies saving Sakuta). When Sakuta changes the past to save Mai, the chain of events that leads to the transplant is broken, making it impossible to save Shoko without letting either Mai or Sakuta die.

Adult Shoko explains early on that her existence depends on the timeline where someone dies for her transplant.

Sakuta's injuries are a physical manifestation of the paradox created by adult Shoko's presence in the past. As she spends more time in the present, Sakuta's existence becomes unstable, causing wounds to appear on his body. The more she interacts with the past, the worse his condition becomes.

The injuries begin appearing shortly after adult Shoko reveals herself to Sakuta.

In the final timeline after Shoko erases her memories and passes away, Mai stars in a film based on Shoko's story. This suggests that Shoko's story was still told in some form, possibly through her written works or the impact she made on others, even though she no longer exists in their memories. Mai doesn't remember her connection to Shoko, highlighting the bittersweet nature of the resolution.

Shoko is shown writing her hopes and thoughts, suggesting she documented her experiences.