Ossan Boukensha Kein no Zenkou

Kein, a middle-aged adventurer, finds a rare Resurrection Fruit while gathering herbs and considers selling it. When he meets a young woman searching for medicine to save her companion, she reminds him of Altena, his beloved who has died, so he gives her the fruit for only a small payment. The woman is Anastrea, the strongest adventurer, known as the Sword Princess. The next day, Kein is unexpectedly invited to join an S-rank party. He defeats powerful monsters, earns a great deal of money, and is eventually taken in by a thirteen-year-old saint. His simple life changes through his encounter with Anastrea.