Isekai Kankoshi wa Shugyo Chuu!! is a Manga/Manhwa/Manhua in english language, Harem 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

Marco, a boy who admires healers who support warriors and heals all. In order to make his dream come true, he enrolls in a nursing school, "San Castello," which specializes in training healers. However, when he entered the school, it was a world where females were 90% and males only 10%! What fate will fall upon our plucky protagonist is...!? A little naughty struggle featuring the sweat and tears of a shota aiming to be a Healer!!!!
Not to mention, contrary to the fun school life he hoped for, this school has various courses which will put his own life at risk!