Panty Panic ist wieder da! Und nun alle zusammen! "Panty Panic! Panty Panic!" Viele Dinge werden enthüllt, darunter auch der Zusammenhang zwischen Yuta, der Höschen sieht, und dem Ende der Welt.
Yūta returns to his own body on December 21, right after the busjacking incident. After reviewing the upcoming important dates, Yūta is informed by Chiranosuke that he must change the future, which his previous selves failed to do, without revealing the truth to anyone or changing the future without his permission, further explaining how his nosebleeds results in mankind's destruction. After setting up talismans to keep his spirit double from reaching his body, Yūta decides against writing "U-Turn" into the Nandala-Gandala, feeling it would be admitting defeat, while also managing to prevent his spirit double from seeing the girls' panties. The next day, as Yūta tries to ask Rabura about Gliese, he spots Tomoda and pursues him, but is stopped by Chiranosuke, who tells him not to undo the events that helped the residents form bonds with each other. Chiranosuke further explains that the reason Yūta's soul so easily detached from his body is related to an event nine years ago.
Un astéroïde menace de s’écraser sur la Terre. Personne d’autre que Yûta Iridatsu ne peut sauver notre planète de son funeste destin… mais y parviendra-t-il ?
Con gli inquilini del Koraikan, ritorna Panty Panic! Assisteremo a nuove rivelazioni, tra cui quella che lega la reazione di Yuta alla vista delle mutandine, alla fine del mondo.
あのパンツパニックが帰って来たぞ！ さあ、みんな一緒に！「パンツパニック！パンツパニック！わぁー！」人類滅亡とパンツの関係、遊太の秘められた過去等も明かされつつ、物語は怒涛の折り返し地点を迎える！
과거로 돌아온 이리다츠는 지구가 멸망하기 전의 일을 하나하나 되새긴다. 그리고 계획을 실행하던 중 영혼이 된 또다른 자신과 마주치가 되는데…
Yuta decide regresar en el tiempo y hacer un recuento de los eventos ocurridos para ver dónde puede hacer algo diferente y así cambiar el futuro de la humanidad.
