Genshin Impact: Love Is the Best Cure

Lin Sheng was about to start a good life with his younger sister when he woke up one day with no memories at all, having transmigrated to a place that was both unfamiliar and familiar. He took shelter with the Niwa family. Later, after the events at Tatarasuna, he fled with the disillusioned Kabukimono, but in dream after dream he nearly had his body taken over, and his consciousness fell dormant. The System eventually arrived, and he woke up to travel across Teyvat. The story after the System's hasty departure...

To be continued! (Go read it yourself.)