When he woke up, Rain discovered that he had transmigrated to the Nasuverse.
The good news: He hadn't become cannon fodder, but a summoned Heroic Spirit.
The bad news: He was an ordinary person who couldn't even fight off a chicken, and his Master was... Sajyou Manaka, the girl known as the "Daughter of the Root"!
At the time, Manaka was high above him. She glanced at Rain's mediocre stats and lost interest. "You don't even have a holy sword. You're not my prince. Stay in the corner and don't get in the way."
Rain was overjoyed. "This kind of good fortune is possible?!"
He started living freely across the various Singularities, and happened to form bonds with quite a few Heroic Spirits.
However, when Manaka accidentally discovered that Rain's soul, unbound by the Root, was the only variable and miracle in this boring world...
She completely panicked.
No matter how meekly she pleaded or how desperately she begged, Rain always gave the same reply: "Sorry, I'm so weak. You're out of my league."
Much later, after enduring countless hardships and nearly abandoning every shred of dignity just to get what she wanted, Manaka had become a completely different person.
