Um ein Magier zu werden, braucht man ein Forschungsthema, welches in den Archiven der sieben Todsünden zu finden ist. Während er noch über sein Thema nachgrübelt, wird er und drei andere in einer Barriere ohne erkennbaren Ausgang eingesperrt. Doch dann müssen Lilith und die anderen dringend aufs Klo … Viel Glück, Mädchen!
After Arin following Arata the whole day, he stops her to question what she was doing. Arin told the reason for following him is that she will be the Demon Lord's wife. Serina, Lilith and Levy, together with Arata, were suddenly trapped in his room by a seal placed on the room. While trying to break the seal, all of the girls start having the urge to go to the bathroom, which ensues panic. Running out of ideas, the group tricks the grimoire into telling where the seal was. Arin confesses to placing the seal and explains the reason for trapping Arata and the three girls in the room, before proceeding to use her spells to break the grimoire's control over Arata's power, creating the Black Sun Phenomenon, which is a Breakdown Phenomenon. Grimoire Security members Mira and Akio arrive and then proceed to attack Arata after a short conversation after learning he is the cause of the Breakdown Phenomenon.
Alors que Lilith apporte quelques précisions sur la magie et le grimoire qu'Arata détient, un sort s'abat sur eux, enfermant le jeune homme avec trois des Trinity Seven. Qui a fait ça ? Et surtout, pourquoi ?
魔道士になるためには、7つの大罪をアーカイブする研究テーマが必要だ。
寮でテーマを考えているとき、アラタたち４人は結界に閉じ込められる。出口はどこにもない。その時、リリスたちがオシ○○をもよおしてきた。大変だ！ 美少女たちのオシ○○の危機だ！
Arata sigue sin entender en qué consiste lo de ser el candidato a rey demonio. En esta entrega quedará encerrado en su habitación sin saber el motivo. Más adelante descubrirá que lo de rey demonio es más serio que lo que pudo haber imaginado.
Per poter diventare un mago, Arata deve ricercare un tema che contiene uno dei sette peccati capitali. Pensando al suo tema, Arata ed altre tre vengono bloccate in una camera da una barriera. Dopo un po' di tempo, Lilith e le altre hanno bisogno di andare in bagno, ma... non possono, chiaramente.
