46-okunen no koi is a Japanese manga series written and illustrated by Anna Shinohara. The story follows the life of a high school girl named Yuri who discovers a mysterious stone that transports her 46 million years into the past.
There, she meets a young man named Kuwan who becomes her protector in this prehistoric world. As Yuri tries to find a way back to her own time, she and Kuwan develop a deep bond and eventually fall in love.
The series explores themes of time travel, love, and survival as Yuri and Kuwan navigate the dangers of the ancient world while trying to overcome the obstacles that stand in the way of their relationship.