Isekai Yururi Kikou: Kosodateshinagara Boukensha Shimasu

Synopsis:
Due to a God’s mistake, Takumi Kayano lost his life and was reincarnated. He received various skills and was sent to another world, where he found himself in the middle of a dangerous forest teeming with monsters.
In that forest, Takumi found a boy and a girl who appeared to be twins. He named them Alan and Elena and took them into his custody. Despite being shocked at how easily the twins beat the monsters with their fighting skills, Takumi made it to town and to make a living he registered to the adventurer’s guild.
Now his life of leisurely living as an adventurer while looking after Alan and Elena growing up had just begun.