One day, the life of middle-aged Japanese businessman Ryoma Takebayashi came to a rather sudden and disappointing end. Ryoma had never had a blessed life, but after his death, three great gods sought his cooperation and reincarnated him as a child in another world with swords and magic!

最弱の少年がとある事件をきっかけに逆光源氏計画を目論む最強女師匠たちに目をつけられ、世界最強へと育てられていく！　最強お姉様たちと最弱の少年が織りなすレベル０のヒロイックファンタジー！

After a freak lightning accident zaps him dead, 15-year-old Mochizuki Touya wakes up to find himself face-to-face with God. “I am afraid to say that I have made a bit of a blunder...” laments the old coot. But all is not lost! God says he can reincarnate Touya into a world of fantasy, and as a bonus, he gets to bring his smartphone along with him! So begins Touya's adventure in a new, anachronistic pseudo-medieval world. Friends! Laughs! Tears! Inexplicable Deus ex Machina!

キャラ濃い目な二人の、焦れあまラブコメ！ベンチプレス130kg！　筋トレをこよなく愛し、柔道部やラグビー部の猛者たちからも尊敬を集める学校一のマッチョ・須田孝士。かたやSNSフォロワー50万人超の犬浦藍那は、ギャルJK界では目下人気急上昇中のインフルエンサーで、モデルデビューも決まっている。そんな超高校級な二人は、お互いに片想い中。

Sagara Sousuke isn't your typical high school student. He reads military enthusiast magazines; he responds to questions with "affirmative;" he brings grenades to school in his bag. Though everyone at school takes him for a hopeless military geek, Chidori Kaname thinks there might be something more to him. When their plane is hijacked in the middle of a field trip, Kaname's instincts will prove correct: Sousuke is an elite, mech-piloting mercenary... and he's here to protect her!