|Tuka Luna Marceau|
|Rōmaji||Tyuka Runa Marusō|
|Air Date||January 22, 2016|
|Opening||GATE II ~Beyond the World~|
|Previous Episode||The Imperial Capital Quake|
|Next Episode||The Fire Dragon, Once More|
Tuka Luna Marceau (テュカ・ルナ・マルソー Tyuka Runa Marusō) is episode 15 of the Gate - Thus the JSDF Fought There! anime.
Yanagida asks Itami to head to the Elbe Kingdom to scout for natural resources they can exploit but he refuses as the Fire Dragon is there and he won't endanger his soldier's lives. However, Tuka's PTSD has gotten worse and she believes Itami is her father as result of Yao forcing her to accept her father was killed by the Fire Dragon. Confronting Yao, she reveals she is desperate for Itami's help to save her people even if it means hurting those close to him.
Meanwhile, Diabo and Pina learns Zorzal has been officially made heir to the throne and, aware of his father's plans, won't become his father's puppet. Unknown to them, Zorzal is being manipulated by Tyuule, who seeks revenge against the Empire and plans for it's destruction by having Noriko killed and framing Pina for it. Itami pretends to be Tuka's father for the time being but is warned if she doesn't accept the truth, Tuka will go mad. After having a talk with the disguised King Duran of Elbe, who is recuperating at Alnus, Itami finally decides to help Tuka confront and take revenge against the Fire Dragon, which will end her delusions.
Rather than going to Elbe with his men, Itami decides to bring Tuka, Rory, Lelei and Yao instead with a Humvee with supplies provided by Yanagida for their journey. We also get a glimpse into Itami's past.