In place of her adopted sister, Wisteria took on the position of becoming a guardian of a poisonous otherworld. One day, a man who resembled her first love dropped out of the sky. His name was Lloyd. To her surprise, he is the son of her adopted sister and first love! To win the hand of the princess, he has come to ask for Wisteria's partner, Saltis, a sentient holy sword. Having survived in the otherworld frozen in time, Wisteria easily defeated Lloyd and told him to go home... But despite her best efforts at persuasion, Lloyd refused to leave. "Please take me as your apprentice, until I get strong enough to defeat you!" So began a one-sided relationship between master and apprentice. Will her time, which has remained frozen for so long, begin to move again?A master-student love fantasy between a lonely former noble lady and a prodigy prince!