Dr. Stone › Saison 1 Dr. Stone : Stone World

Chapter 23 — Episode 23

**Beginning:** First, Senku and the Kingdom of Science group gather at dawn, with Suika using a newly made telescope to observe the sunrise. Senku reveals that the rare blue stones they mined contain tungsten, the universe's most heat-resistant metal, and explains that the phone requires four key components: a vacuum tube, plastic casing, a microphone, and gold wire. He announces they are entering the final push to complete the mobile phone before spring, when Tsukasa's army is expected to attack. **Middle:** Then, the team begins the complex process of extracting tungsten by crushing the blue stones — Magma smashes them impulsively, which turns out to be correct — then chemically processing the powder and heating it past 1,000 degrees using a combined effort of bellows, fire, and electric power. Senku next tackles the vacuum tube's glass component, requiring a Hickman pump of extreme suction power, which master glassworker Kaseki manages to craft. Meanwhile, Gen is tasked with building 800 manganese batteries, and Kohaku's group produces a crystal microphone using Rochelle salt made from wine residue and burnt seaweed dissolved in hot water. **Finally**, all four components — plastic casing, gold wire, vacuum tube, and microphone — are completed one by one and assembled. Senku successfully builds the mobile phone just before spring arrives, and the entire village celebrates. At the end, Senku declares that the final battle against Tsukasa is now ready to begin.