企图消灭日本所有妖怪的神秘存在。为了对抗这个敌人，妖怪们接连集结在优人与绯鞠的身边。面临这样的紧急状态，绯鞠不禁懊悔于之前和九惠守决斗而失去名刀“安纲”。至于优人自己，也下定决心要亲自参与这场战斗。

企圖消滅日本所有妖怪的神秘存在。為了對抗這個敵人，妖怪們接連集結在優人與緋鞠的身邊。面臨這樣的緊急狀態，緋鞠不禁懊悔於之前和九惠守決鬥而失去名刀“安綱”。至於優人自己，也下定決心要親自參與這場戰鬥。

After a report from Aya about one of the lands she came across being ravaged by Tama, Ageha comes up with a plan to awaken Yuto's powers by having the girls dress in cosplay outfits, with Ageha herself wearing a revealing schoolgirl outfit. She then starts to seduce Yuto until Himari, wearing a cat costume, stops her. Later on, Himari tries out another katana from Noihara's waepon vault but is dissatisfied until Kuesu arrives with her damaged Yasutsuna, in which Ageha has Sasa repair it with her eye beam. At the playground, a worried Yuto tells Rinko that he still wants to settle the conflict with Shuten-doji and Tama without resorting to violence. Shizuku and Kaya later appear and reveals to them about Shuten-doji and Tama's origins and their agendas. At night, Yuto tells the girls that he still wants humans and ayakashi to coexist and proclaims he will fight Shuten-doji and Tama for that cause. At the park, Kaburagi meets with Shuten-doji and Tama, who agrees to Kaburagi's deal not to harm any humans during their plans. Late at night, Himari sets off for Shuten-doji and Tama only to find Yuto blocking her path. After he tells her that they have to stick together, Himari embraces him in tears and, just when they were about to kiss each other, Kuesu interrupts them with the other girls following suit which later leads to a series of misunderstandings.

日本中の妖を滅ぼそうとしている、謎の存在。それに立ち向かうため、優人と緋鞠の元に、続々と妖たちが結集してくる。この非常事態に、くえすとの決闘で名刀・安綱を失った事を悔やむ緋鞠。そんな中、優人は自分自身も戦う決意を固める。