Nanana's Buried Treasure

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.