Zoku Youjuu Senki -Suna no Mokushiroku-

It is now the year 2048. You are the captain of Anti Strangebeast Special Police (A.S.S.P.) created to deal with the nuclear post-apocalypse gene outbreak.
You've repelled the beasts from the Sophia police district, but the battle is long from end. Next A.S.S.P assignment is to destroy the beasts outside Sophia police district and to weaken them. The time of direct conflict has come.

[From vndbreview]