Akira cries in front of Towasa’s house in Dusk Beyond the End of the World episode 0. He expresses that he wants to see his parents. Towasa runs to Akira. She hugs the boy. She knows he dislikes being alone. She tears up. She promises that she will accompany him. She tells him that they’re a family. Professor Kazuya hugs the two kids. He comforts Akira that he will be fine.
Towasa is working in her room. The TV plays the news that the people protest against AI. Towasa thinks human’s soul is just radio wave responds of all organs. Akira is sleeping in his room. He has a sweet dream that Towasa kissed him. He feels embarrassed. He reads the news. He learns that Towasa is famous. He’s going to have breakfast with Professor Kazuya. He helps his uncle take the breakfast.
Towasa walks out of her room. She says good morning to Akira and Professor Kazuya. Akira realizes that his sister worked through the night again. Towasa mentions the people liked her robot. She learns that he’s going to go to work out. She thinks the youth is pretty good. He catches the chance to invite her to his school. But she asks him to assist her in her research. Akira goes out. Professor Kazuya mentions he has adopted the boy for ten years. Towasa offers to celebrate it.
Akira walks out of the house. He sees the reporters. He reveals he wants to be the man who deserves Towasa. But he doesn’t know what to do. Akira’s parents died in a car accident. His father’s best friend Professor Kazuya adopted him. Professor Kazuya took Akira home. He told the kid that it’s his home. Towasa asked Akira to call her old sister. She smiled at him.
Akira thinks Towasa is his family. But he doesn’t want to be her brother. He throws the javelin on field. He mistakes that he won. But he’s told that he lost. Akira’s classmate is very happy. Because Akira is going to buy him a meal.
Towasa completes her work. She checks Akira’s photos because she wants to give a present to the boy. But she finds out that the boy is very handsome. She blushes. Akira returns home when Towasa is washing her hands in the bathroom. She walks out of the bathroom. She asks him to let her know if he has any problem in the school. He laughs and he thinks she’s like his mother. She’s furious to claim that she’s his sister. She informs him that the dinner is ready.
Akira has dinner with Towasa. He’s very happy because the dish is delicious. She reveals the dish was cooked by her. She wonders if he wants to eat any food. She plans to cook it for him tomorrow. But he points out that it’s his turn to cook tomorrow. He wants to try a new recipe. She gives an awkward smile.
Towasa is told that her company isn’t allowed to develop AI robot. Professor Kazuya believes that someone was behind the case. Towasa gets angry after knowing those people went against her. Professor Kazuya calms his daughter down. He plans to ask his friends about it. He visits Akira when the boy tries to find a way to help his sister. He asks him to support Towasa.
Professor Kazuya reveals their company wasn’t allowed to develop AI robot because their rival did something dirty. Towasa wishes that it won’t affect her project. Akira invites her to go to the zoo with him. She runs into her room. She thinks it’s a date when she lies in the bed.
Towasa and Akira go to the zoom. She’s very happy after she was the elephant. He takes her to a cafe. He gives the pet robot to her. He expresses that he doesn’t want to be her brother. She knows what he means. But she changes the subject.
Towasa and Akira take a walk. She gives the present to him. He opens the present. He sees an album and a music player. She reveals she recorded the past decade of their lives. He opens the album. He sees the group photos of them. He’s moved. She tries to give him an answer about his words. But he thinks she doesn’t have to mind it. He asks her to marry him after knowing she likes him as well. She agrees to it. But she thinks they should begin it from dates first. She’s happy to hug her. It promotes her to scream. He tells her that he likes her scream. She offers to be family after they get married. They return home. They’re very happy after they became lovers. Towasa decides to change her plan about AI robot.
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Towasa attends the shareholders’ meeting. She wears a beautiful dress. She wishes more people to join her. She throws herself into Akira’s arms. Towasa walks to the stage. She tries to introduce her project. But the guy rushes to the stage. He shoots Towasa. Akira tries to protect his girlfriend. But he finds out that she’s bleeding. The two cops take down the culprit. But the culprit shoots Akira. Towasa cries after Akira passed away. Akira wakes up. He feels embarrassed because he doesn’t wear clothes. He sees the abandoned city.