Tetsuya Shinjo, a time traveler, a social beast who died suddenly while working overtime in his previous life, is now Rintagaki Sakonji's eldest disciple.
He thought he was just an ordinary person. So if others swing their swords a thousand times, he swings them ten thousand times. He used the stupidest method to train himself into the Demon Slayer's Water Pillar.
Until one day, his seriously injured junior brother completed his transformation in his arms.
"Senior brother... I'm still me... It's just... I've become like this..."
Tetsuya hugged his junior brother who had turned into a charcoal, his mind went blank.
Then he discovered that this wasn't the first time, and it wouldn't be the last. Those men defeated by him will slowly turn into women. The memory is still there, the personality has not changed, but the gender has been changed. After the transformation, their emotions towards him will be appropriately amplified - what was originally admiration will turn into attachment, what was originally gratitude will be turned into heartbeat.
The problem is, he really didn't do anything.
He just fights normally, saves people normally, and is gentle to everyone normally. He would just keep vigil when Masaki was injured, fight tooth and nail when Kanae was in danger, and hand rice balls to Kanae when she was lonely.
Then they all came.
After the decisive battle in Infinite City, when everyone stood in front of him, he finally asked the question: "Are you... Sure?"
No one answered, but everyone's eyes told him the answer.
This is the story of a hard-working genius who unknowingly captures everyone with his strength and gentleness.
The battle is passionate, the daily life is warm, and the emotional lines are natural.
As for the junior brothers who have changed - they don't mind, so what else can he say?