MTL - Space Speed Xing Hen - Chapter 5 Miracle Creator (below)

The MC transmigrates to the Narutoverse in the body of an orphan boy from the Senju clan, as a normal person from modern Earth he has little to no fighting experience, but luckily time is something he has a lot as Naruto is just 6 months old so, he can slowly build his strength to live a “Peace-full” life

A river song, triggered a legend of the rivers and lakes.
Tian Zun’s life motto: “My sword is the truth.”
Shen Lang’s life motto: “To serve people with morality, those who are dissatisfied are dead.”

- Description from uukanshu (translated)

A former sporting rifle shooter genius transforms into the ‘Juvenile Butcher’. While originally supposed to have received the death penalty, he was instead fortunate enough to have entered a secret and highly regarded armed force, throwing himself into the ‘Nirvana Project’.

Iona, the knight who was the loyal dog of the tyrant Emperor, gave her life for him. But her lord, whom she trusted, abandoned her in the end, and the person who stood by her side in her death was no other than her husband.“I want to kiss you one last time.” Iona demanded on the verge of death.“I’m telling you in advance… Just in case… You won’t die and this won’t be our last kiss.”Satisfied with her non-lonely death, she closed her eyes.When Iona woke up again, she realized that she had returned to the past and her husband was again chosen to be her partner.Though her past wasn’t good, one thing she also didn’t want to change was her husband, the only success in her life. If so, she should at least turn this marriage into a ‘successful marriage’, she decided.“Lord Leroy, I will formally propose to you; Please marry me. I will definitely make you happy.”Iona was determined to repay her husband for his generosity. Just the way she wanted.