夏休みに入った麻桜中学。ヒロも里帰りして、ゆっくりしたいところ。だが生徒会長、黒姫ルシフェの襲撃を受け、やむなくリュウナの里帰りに便乗し一時退避することに。行先は最強魔王、竜王(リュウナの父)のいる竜宮城!?駆け出し勇者がいきなりラスボスの城突入+ご両親にご挨拶と、二重にヒロの心臓はばっくばく。ヒロの夏休みの行方は!?
10 卷
魔王学校に俺だけ勇者！？
2010-11-01
魔王学校に俺だけ勇者！？二時間めっ☆
2011-03-01
魔王学校に俺だけ勇者！？三時間めっ☆
2011-06-30
本卷
2011-10-29
魔王学校に俺だけ勇者！？五時間めっ☆
2012-01-30
魔王学校に俺だけ勇者！？六時間めっ☆
2012-05-01
魔王学校に俺だけ勇者！？七時間めっ☆
2012-07-30
魔王学校に俺だけ勇者！？八時間めっ☆
2012-11-01
魔王学校に俺だけ勇者！？九時間めっ☆
2013-01-31
魔王学校に俺だけ勇者！？十時間めっ☆
2013-05-31
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