Ep. 1: Summer Break Journey to the Underworld with Occult Research Club

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Issei suffers recurring nightmares about his first girlfriend, Raynare, causing him to doubt his current companions. He wakes to find the Hyodo residence rebuilt as a three-story mansion with a pool, though his parents believe the Gremory family handles construction. As summer vacation begins, the Occult Research Club travels to the underworld via a protected train route, encountering Sona, Genshiro, and Tsubaki. Koneko remains subdued during the trip. Azazel orchestrates a surprise attack to assess each member's training needs and expands Issei's perverted knowledge of the female body at the hot springs. Meanwhile, Kuroka expresses her desire to meet her younger sister, Koneko.