Still More

Large corporation creates a huge artificial Desire Island that becomes a place for 10,000 people to live. On the facade there are a lot of tourist and leisure spots, as well as casinos. But behind the scenes there is an underground world full of drugs and weapons trade. The United Nations receive evidence of new inhuman biological weapons researched there, but official units don't find any evidence of it. Special forces were also sent in secret, but all of them got annihilated without any trace. Main character's purpose is to replace mercenary "Bear", train heroine "Aya" and then defeat and torture four leaders to obtain information.

[From vndbreview]