The June Bride of Humanity's Strongest

The third instalment of the Saikyou Series. 

Aikawa Jun, Humanity's Strongest Contractor. At the request of Nagatoro Toromi, she sets out for a newly-born volcanic island. What does Aikawa Jun have to compete for survival with? Plants?! A spectacle of the "strongest", sprouting from "nonsense", and growing beyond "human"! 

(Source: Kodansha, translated)

The fifth instalment of the Saikyou Series. 

The most strongest heroine in 10,000 years. 

Aikawa Jun, a famous detective and Humanity's Strongest Contractor.
A non-stop mystery about two beautiful women and a serial killer. 

Don't interfere with my journey. I'll kill you. 

Aikawa Jun, Humanity's Strongest Contractor.
She is assigned to accompany Jikumoto Miyori, a nineteen-year-old authority on psychology, on a field investigation. It was supposed to be a fun trip with the addition of the overly perfect maid, Handa Rei. However, at their destination in Venice, a couple of tourists and famous actresses are brutally murdered one after another via drowning.
The "drowned killer" has his claws on these women, too—?! 

(Source: Kodansha, translated)