Gensou Mangekyou: The Memories of Phantasm - episode 8 - 28 Dec, 2016

The residents of Gensokyo begin to suspect that something is wrong with the moon, and that, the night does not seem to end. Marisa and Alice go out to find the culprit for this imperishable night. After defeating Mystia Lorelei and Wriggle Nightbug, Alice and Marisa go to the Human Village, where Keine Kamishirasawa says the culprit is in the Bamboo Forest of the Lost. Arriving there, they are confronted by Reimu and Yukari Yakumo, who were also investigating the incident. The magicians think that Yukari and Reimu are the culprits, and a battle begins. During his battle against Reimu, Marisa accidentally sets fire to Eientei, and Reimu reveals that the culprit for this incident is there. After this, Reisen Udongein appears to confront them... (Source: TheTVDB)