Nidome no Isekai, Shounen Datta Kare wa Toshiue Kishi ni nari Dekiai Shitekuru

One day, Sara is transported to another world and saves a boy named Luke who was pursued and collapsed in the forest for some reason, and decided to live together with him. However, just as Luke is beginning to recover from his injuries, Sara is abruptly sent back to her own world. Three years later