Tensei Akuma No Saikyo Yusha Ikusei Keikaku 1 (OVERLAP) [Light Novel]

[Machine Translation] Kakyu, a former Japanese who was reincarnated as a lower level demon. As a result of his training using the knowledge from his previous life, he had become so powerful that no one could stand next to him! However, while traveling freely in another world, he learns that the village he was taking care of was destroyed overnight. When he rushed to check on the village, he found Als, the only surviving baby. In order to repay the villagers for their kindness, Kakyu decides to raise Arus, hiding his true identity, but in fact, he is the "hero" who will save the world! Furthermore, the "wife" he contracted to raise Ars is the most powerful assassin in the world! However, when Ars goes to a country to participate in a martial arts tournament, he finds himself caught up in a conspiracy with powerful people! To protect his family, he decides to secretly work behind the scenes...? Invincible devilish parenting will save the world! The otherworldly fantasy of the strongest family is about to begin!

下級悪魔に転生した元日本人・カキュー。前世の知識を活かした修行の結果、いつしか横に並び立つ者がいないほどの実力を手にしていた!しかし、異世界で自由気ままに旅をしていたところ、世話になっていた村が一夜にして滅ぼされたことを知る。村の様子を見に駆け付けると―唯一生き残っていた赤子・アルスを発見。村人たちから受けた恩義に報いるため、自身の正体を隠して育てることにしたカキューだったが―実はこのアルス、世界を救う“勇者”で!?さらに、アルスを育てるために契約した“妻”は、人類最高峰の“暗殺者”!?「どうせならアルスを世界最強の男に育てよう」ところが、アルスを武術大会に参加させるために訪れた国で、権力者たちの陰謀に巻き込まれてしまう!そこで家族を守るため、裏でこっそり暗躍することにして...?無敵の悪魔流子育てが世界を救う!?最強一家の規格外異世界ファンタジー、開幕!!