Ep. 25: Hayato visita a la madre enferma de Ryuuji en Nagoya antes de que el Shinkansen Negro ataque a Ōmiya

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Hayato goes to Nagoya alone to visit Ryuuji's mother, who is ill in bed. He then finds an unexpected connection between his father and Ryuuji's. Hayato learns little bit about his situation while interacting with Ryuuji's family. However, at that time, the Black Shinkansen that has gained a new power appears in Ōmiya! Hayato and Ryuuji rush from Nagoya back to Ōmiya. What exactly is the aim of the Black Shinkansen...? (Source: Shinkalion Wiki)