Lion Coeur Senki is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Tanaka was a salaryman who lived an average life. That life came to an end when he was 41 years old…or it was supposed to. But when he came to his senses, he was standing in a world that resembled ‘Medieval Europe’. There was no heating system, and food was eaten with your hands. On top of all that, pigs ran wild in the city…and what did the pigs eat? Shit. And in this harsh world, Tanaka would live his second life as ‘Varian De Lioncoeur’. Will this average salaryman be able to survive?