I Love You (Though it's Inadvisable)
Atsumu first found himself switching into his soulmate's body at age four. The visit itself was short, disorienting, and he learned next to nothing about the person who was apparently perfect for him.
But it was all the switches after that which counted, and the more he switched bodies with Sakusa Kiyoomi, the more he fell in love with him.
- Part 1 of I Love You (Though it's Inadvisable)