Tensei Mao No Daigosan Yuno Mao Gun No Sekai Seifuku Saitan Route (GA Bunko) [Light Novel]

[Machine Translation] Even the most powerful demon king of all time, Kengo, had a secret that he could never divulge. ( Isn't the situation worse than before his reincarnation? ) In his previous life, he was Inui Kengo, a herbivorous high school student who was mistaken for his brother, a legendary delinquent and respected by his younger siblings! This time, Kengo wants to live in peace, but he is now being vassalized by even more vicious demons, and he is on the edge of his seat, wondering when they will discover his true nature. However, he is revered as an invincible king when he masterfully uses defensive magic to spare his life, he is popular for his isolation even though he just doesn't dare to touch a harem, and he is praised as a wise and attentive ruler when he looks at his subjects. This is a success story of a reincarnated Demon King who has no strength or power of his own, and even his fame has skyrocketed due to a series of miscalculations!

歴代最強の実力を持つ魔王ケンゴーにも決して漏らせぬ秘密があった。「転生前より状況がひどくない!?」前世の彼は、伝説の不良だった兄と勘違いされ舎弟たちから尊敬を集めた、草食系高校生の乾健剛だったのだ!今度こそ平穏に生きたいのに、より凶悪な魔族達に臣従され、いつ本性を見抜かれるかハラハラの生活を送るケンゴー。だが命惜しさに防御魔法を極めれば無敵の王と畏敬され、ハーレムに手を出す勇気がないだけなのに孤高だと逆にモテ、臣下の顔色を窺えば目配りの効く名君だと絶賛の嵐で、第二の人生は順風満帆!?これは己の強さも権力も持て余し、誤算続きで名声まで爆上げしてしまう、転生魔王のサクセスストーリーである!