恋した人は、妹の代わりに死んでくれと言った。　―妹と結婚した片思い相手がなぜ今さら私のもとに？と思ったら―@COMIC

Synopsis

In place of her sister, Wisteria took on the job 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 was the son of her 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 other world 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!