Death March to the Parallel World Rhapsody Vol. 11 (light novel)

Though Satou's stay in the Labyrinth City got off to a rocky start, he's
determined to put Celivera on the road to redemption! Charitable endeavors such
as catching a bandit leader and founding an orphanage are no big deal for him,
but despite his best efforts, the mysterious drug continues to circulate.
Luckily, he may have found a new lead...