Identify Girls Capture Game

[Arslow]

Hello, I'm searching a certain game i saw before but don't remember the name, only the setting.

The MC capture girl monster? and one of the possible ending? is where he capture a classmate? when she was transformed into a monster by the Last Boss?.
The classmate is? a the typical honor student for monster capture in the class and the MC is? the typical trash student.
The game have a fantasy anime setting and, i think, the game background story is on a island. And not sure if it's a website game or engine game (not website).

Sorry for all the question mark, i'm not sure for these part only.

 

[kuruvit]

Im not sure but you can try this one, Erokko Monsters or maybe theys one Pocket Gal Hunter. The second is more like Pokemon, the first fits more in your description.

 

[PleaseDoNotLewdKomi]

I know this is late but what you are looking for is

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by Alicesoft. The monster girls are the typical monster girls from a lot of Alicesoft games such as Evenicle and Rance. It matches all the description.