This smartphone app is the English-language version of Ai wo Sasagu Densetsu no Kishi（愛を捧ぐ伝説の騎士）, a hugely popular romance game in Japan in which users can experience a love story as the princess of a kingdom and the knights who protect her. The stories and characters appear just as they did in the original Japanese release, allowing users from around the world to enjoy the app in its entirety in English.
Because I was not too interested, I played only Lute.^^;
and his story was just at half price. lol