I, who blocked the demon king’s ultimate attack, ended up as the little hero’s nanny 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.cc fastest updating comic site. The Summary is

“The strongest shield” teams up with “the weakest carry”! Watch as this pair of oddballs rely on their survivability to grind enemies to death and lead comfortable lives in this world where every man is out for himself!