Toaru Majutsu no Index: Genesis Testament - Volume 2, Epilogue: Greeting Through the Bars — Matching_Complete.

She, a modern hidden ghost leader of an organization which gathered insane prodigies proficient in the various differing skill-sets. Highly skilled in medicine and poison, executes covert assassinations, viewed as insane and demonic in the eyes of people of the world. Killed in an accident, and reborn into the body of a disfigured young girl.

What? Face disfigured, identity stolen? A return to the family dim and hopeless? Her identity can be given up, her family can be forgone, but as for the one who harmed her predecessor who inhabited this same body, if she didn’t at least make them scream in unimaginable agony and throw them into a state of wretchedness, how could she live up to her demonic reputation? Endless turmoil ensues and it’s a battle to dominate over all! See how she shook the world dressed in a suit of red, her sword up against the dominant powers that rocked the Heavens! Her name spread across the seas, shocking the earth!

- Description from Novelupdates

High society CEO Big BOSS Lu expresses that he’s felt stifled recently. Ever since a woof style creature intruded upon his home, his life has become a complete mess. A slight conflict in opinion and his couch is hijacked, his desk seized, his lap forcefully occupied, even his bed was forcefully dominated!

The small Sammy, with his head resting upon his waste removal official’s thigh and four paws facing the sky exposing a soft little belly, with a face full of untainted purity and a pair of innocent eyes: “Woof~”

Big BOSS Lu lowers his head and makes eye contact for three seconds : “…. Give give give! Whatever you want, I will give it to you!”

- Description from Novelupdates

It’s the vacation of a lifetime, a trip to a remote island filled with geniuses and murder.