The Merry Widow and the Robber’s Quartette

Lupin receives a letter from Jigen and Goemon asking for help. He heads for their location, but finds the men of Gemallschaft, this village which isn't to be found on any map, where the church bells ring, living their lives under the guidance of Sister Labina. Jigen and Goemon seem to be different people. The secret is the sound of the bells.

Synopsis excerpt via Kitsu.