Kuro no Tsuki Gaiden ~Gen'ya no Sho~

Four years after events of Kuro no Tsuki.
The slowly regains peace. The towns are revived, and those who lost relatives learn to nurture new love.
One day Altraud gets a letter saying “I want you to leave my church”. Once again he sets to the Black Kingdom to uncover the mystery...

[From vndbreview]