Dear Shimazaki in the Peaceful Land is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here. You are reading chapters on ManhwaZ fastest updating comic site. The Summary is
As a child, Shimazaki Shingo was kidnapped by an international terrorist organization and raised as their combat agent. After 30 years, he finally made it back to his peaceful hometown in Japan. Will Shimazaki be able to live a peaceful life in this new world? From the large-scale newcomer Goten Hamada and the artist Takeshi Seshita, the creator of “Harn – Grass, Iron and Sheep -” and “Invincible”, an action story of a man who lives between everyday life and the battlefield!