龍ヶ嬢七々々の埋蔵金

Disowned by his father, high-schooler Juugo Yama transfers to Nanae Island, an artificial student city built by the Great 7, and rents the cheapest apartment he can find. The room turns out to be haunted by Nanana Ryuugajou, a member of the Great 7 murdered a decade earlier and now bound to the unit, eating pudding and playing handheld games. Vowing to find her killer, Juugo joins the school's Adventure Club alongside the would-be detective Tensai Ikkyuu to hunt down the Nanana Collection, the cache of strange artifacts she scattered across the island in life.