Mt. Hakone to gather sulfur. Their goal is to create gunpowder as a defensive weapon against the powerful antagonist Tsukasa Shishiou (Dr. Stone Wiki).
: The explosion acts as a smoke signal, which is unexpectedly answered by other signals in the distance. This reveals the possibility that other conscious humans exist in the stone world ( Screenspy ). DrStone_Ep_04_ITA.mp4
In this episode, the protagonist Senku and his companions, Taiju and Yuzuriha, travel to Stone Wiki)
: The episode features a flashback to Senku’s childhood, showing his early passion for science and his father’s support in his pursuit of becoming an astronaut (Screenspy). In this episode, the protagonist Senku and his
: Tsukasa arrives at their camp and takes Yuzuriha hostage. He demands that Senku renounce science in exchange for her life, viewing scientific weapons as tools of destruction that would ruin his vision for a "pure" new world ( Otaku Orbit ).
: Senku successfully mixes sulfur, charcoal, and other ingredients to create gunpowder. An accidental explosion during the process alerts others to their location ( Crow's World of Anime ).