Good Deeds of Kane of Old Guy

Kein a middleaged adventurer who while in the middle of herb gathering found a rare item Resurrection fruit
Kein thought about selling it and turned it into money but he met a girl seeking medicine to save her companions life
She looked like Altena his childhood friend who already died he gave it in exchange for small change
Actually the girl was the strongest adventurer Anastrea people called her the sword princess The next day Kein suddenly got an invitation to join an S rank party beat down the strongest and the worst monster miraculously gain lots of money and finally get confessed by a 20 years old saint
Keins simple life will change completely because of his encounter with Anastrea