Crabs and Electricity Are Important (S01E04)

Natsuki is determined to build a tidal power generator that harnesses the ocean's tides. He plunges into the sea to gather materials and manages to salvage resin from the remnants of Ryuuji's family's factory. Once back on shore, he immediately starts working on the project. As they collaborate, Natsuki and Ryuuji have a spirited debate about the best way to construct the generator. Atri steps in, helping to bridge the gap between the two, and they begin to bond as friends. Meanwhile, a shadowy figure lurks outside the school, watching them intently.