"No." Martha tells her solemnly, "We need you in a different world right now. Earth will manage without you for the time being. Besides, there's still some time before the apocalypse starts."
"Apocalypse?" Kyuri and Wakana shout together.
"Yes." Martha frowns a bit. "Since the guardians are taking birth, it means that four horses of the apocalypse will also take birth soon."
"Whoa!" Kyuri raises her hand. "That's scary. When is it going to happen?"
"We don't know when or how it will happen." Martha taps her fingers on the file that she's holding to. "It might happen in this century or the next. It might not happen. But there's always a chance of it happening if one guardian is born."
She looks at Wakana gravely. "Then again, the soul guardian was born and died too early. We can't be sure if it would happen. I haven't heard about other guardians."
Crossover chapters between Supernatural Investigation 101 (Chapters 130 - 135) X His Devious Harbinger (Chapters 190 - 195) are the same. These chapters also have the same titles.