Gathered on the bridge of the airship Fraxinus, Kotori and Tohka learn that Kurumi has traveled back in time 204 times to save Shido. As they ponder the identity of Takamiya Mio, Shido tries to delve into his own memories... 集结到空中舰〈佛拉克西纳斯〉舰桥的琴里与十香等人，得知狂三已经回溯时间并拯救了士道204次一事。另外，为了知道崇宫澪究竟是什么人，士道决定探索自己的记忆……。

As the battle against DEM looms closer, the crew of Fraxinus works tirelessly and with high spirits to prepare. The Spirits engage in making treats in an effort to lift Shido and everyone else's morale. With each passing moment, the time for the decisive battle draws nearer... 即将与DEM开战前，〈佛拉克西纳斯〉的船员们忙乱而士气高昂地准备迎战。为了帮士道及其他人加油，精灵们全心投入制作慰问品。决战时刻正一秒一秒逼近……。

A full-scale confrontation between Shido and his group, Ratatoskr, against DEM began. Kurumi and her alter egos, the AST led by Kusakabe Ryouko, joined in the battle, and as the battle raged, Shido confronted a horde of pseudo-spirits "Nibelcole". 士道等人与拉塔托斯克跟DEM展开全面对决。狂三与其分身，还有日下部燎子率领的AST也加入战局，就在场面越来越激烈之际，士道对上了拟似精灵〈妮贝可〉大军。

At a certain time and place. Shinji Takamiya encounters a spacequake and finds a girl at the scene. She remembers almost nothing about herself, thus she is named Mio and comes to live with Shinji and his sister, Mana. 某天在某个地方，崇宫真士遭遇了空间震，并在事发现场遇见一名女孩。真士为这个几乎不记得自己一切的女孩取名为澪，让她与自己跟妹妹真那在同个屋檐下一起生活。

In the presence of the suddenly appearing girl, Shido recalls various things. The girl's name is Mio Takamiya. She was the one Shido once shared his feelings with when he was Shinji Takamiya. On the other hand, Kotori and the others from Fraxinus are thrown into confusion upon learning Reine's true identity. 面对突然现身的少女，士道想起许多事情。少女名为崇宫澪，是士道曾经身为崇宫真士时，彼此交心的对象。此时，〈佛拉克西纳斯〉的琴里等人也得知了令音的真实身分，现场一片哗然。

Before Shido could rush to Tohka and the others, Westcott stood in his way. Meanwhile, Tohka and the others found themselves helpless against the terrifying power of the angel Mio had manifested, the Sanctuary of All Things In Creation (Ain Soph Aur), as they were cornered with no way out... 士道急忙赶往十香等人的身边，此时威斯考特出现在他的面前。另一方面，十香等人面对澪显现出的天使〈万象圣堂（Ain Soph Aur）〉的恐怖力量束手无策，逐渐被逼入绝境……

Many of the spirits fell from exhaustion due to Mio's Ain Soph Aur. Kotori sent "Fraxinus" toward Mio and released the spirit power cannon “Gungnir,” however... 在澪的万象圣堂面前，精灵们一个个失去力量倒下。琴里指挥〈佛拉克西纳斯〉接近澪，并发射精灵灵力炮〈永恒之枪〉……。

Shido is horrified when Mio tells him that all the spirits are dead. Stunned and unable to move, he was about to have his memory as Shido erased by Mio, but there was still one spirit who had survived. 澪说出其他精灵都已死去的事实，士道因此感到错愕。当他呆站在原地，即将被澪抹去身为士道的所有记忆时，仅存的最后一个精灵出现了。

Before the decisive battle with DEM began, Shido returned to a time when no one had died yet. To avoid repeating the same future, Shido asked Mio/Reine out on a date. After hearing the circumstances from Shido, Kotori and the spirits supported their date. 士道回到了与DEM展开决战前，所有人都还存活的时间点。为了不重蹈覆辙，士道邀请澪=令音与他约会。从士道口中得知情况的琴里与其他精灵们决定协助两人的约会。

Shido brings Reine to the beach where Shinji and Mio once went on a date. Reine's likeability to him increases, and Shido finally kisses her. Kotori and the others, who were watching over them, are convinced that the date is a success. 士道带令音去以前崇宫真士与澪约会时去过的海岸，令音的好感度也随之变高，士道终于成功与她接吻。全程都在观察的琴里等人，本来也确信这次约会即将成功……

Shido and his friends, who had been cornered by the DEM, were saved by Kurumi, who had been presumed dead. This time, however, Mio appears. When confronted with Mio, who is obsessed with her feelings for Shinji, Shido comes up with a plan to save her. 因为DEM陷入绝境的士道等人，被本来以为已经死去的狂三所救，但是这次换澪现身了。士道为了拯救执着于真士的澪，想到某个方法。

While Shido was facing Mio and expressing his feelings, Westcott was activating a terrifying formula. Can Shido, Tohka, and the others prevent his plan? 威斯考特趁着士道对澪表达心意时，发动了可怕的术式。究竟士道与十香等人能否阻止他的企图呢──？