It's revealed that Suu's kidnappers were working for the Black Lily Advanced Materials Laboratory, an organization that helps Liminals immigrate in exchange for their services, such as bodily products.
The mysterious broker that helped Kiira, Kino, & Curie enter the country is revealed to be the President of the company.
Mr. President and Kuroko Smith know each other and have a rivalry.
Suu was kidnapped by accident, as the agents were actually looking for the Liminal she released from containment.
Because Suu was the one who let the Liminal free, Mr. President manipulates Smith into letting Suu help catch the Liminal again, to legally clean up her own mess.
It's shown that Lala's body can sense the general direction of her head, which is how Kimihito and the others were able to find Suu.
Rachnera reveals that Mr President was waiting to "save her" back in Chapter 15 in exchange for what would have cost six months worth of "resource production". However, she didn't call for his aid due to Kimihito being there to help her.