Transmigrating Into Ultraman: Mosa's Return Journey

After dying, a woman’s soul is brought by a man called Ultraman Belial from a parallel universe into his world, where she is made to replace him. A woman replacing a man—what kind of problem is that? Still, since it has happened, she decides to accept it.

What? Mebius actually calls her big sister, and Zero is her disciple? What on earth is going on? Has this world changed after she came here?

This story follows a female lead whose soul crosses into the Ultraman world. Later she gains a new body. Her CP is Cosmos, and the latter part includes a crossover with multiple franchises.