You Promised to Marry Me in Your Next Life, Then My Bro Transformed on the Spot

[Gender swap + supernatural abilities + personal growth + sweet romance + school life]

“In my next life, I’ll be a girl and marry you.”

In a world ravaged by Fallen Star Beasts, partners who can’t activate their link are destined to part ways.

Lu Ze and Su Xing were roommates with a 95% compatibility rate, yet they could never resonate with each other. They were the worst students in the academy, known far and wide. With their advancement exams approaching, the naturally clueless Su Xing earnestly proposed the absurd idea of “getting to know each other more intimately,” and even put on a skirt…

Naturally, he was rejected.

That was until a Tiger-class Fallen Star Beast appeared. At the brink of life and death, those joking words became a vow between their souls. The moment the link System awakened, his former brother really did become his personal mecha girl.

From good-for-nothing to everyone’s favorite, from brothers to…?

When “protecting” turns into a flutter of the heart, and “dependence” becomes “love,” how will the two find an answer that belongs to them amid all their tangled feelings?