It's Dieselmine. You've played this game before. Also, the title music sounds like a cheery version of Paranoid.

http://www.dlsite.com/maniax/work/=/product_id/RJ132520.html/?unique_op=af
http://www.dlsite.com/ecchi-eng/work/=/product_id/RE132520.html

Has Dieselmine ever failed to deliver an immersive porno? No, I didn't think so.

Base +21, Zantos +7, newguy2012a +10, phoenix5980 -6

Dieselmine doesn't know what a plot is so I don't understand how they can deliver an immersive porno... it's just a gonzo.

Original Picture = 毛玉ケヰト

Base +9, Zantos -7, newguy2012a -10, Lus De Blois -8, rjimenez666 -6, koorlink +6

There may not be plot immersion but the cum is certainly very immersive.

Base +22, geisha42 +5, ntrhater +1, draconian196 +9, glitcher998 +8, Zantos +7, newguy2012a +10

A few of their games at least have serviceable plots.

This isn't one of them, though.

Base +6, newguy2012a -10, Lus De Blois -8, Darksword696 +8

Only Saigado can draw good looking bukkake..

Base +11, newguy2012a -10, Lus De Blois -8

eh... dieselmine is still one of the few that consistently make corruption/MC/drugs type of mind-break so they're fine in my book.

also according to the story, protagonist gets his hand on some aphrodisiac he has to put it on his dick and cum inside the women to have any effect(lol) which has the side effect of making his penis larger(lol²), so its pretty standard dieselmine "plot".

Base +7, ichikku +14, Cyber Woo +7, newguy2012a +10

which pics are "animated"?

Base +4

Erogamescape - http://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=20428#ad

VNDB - http://vndb.org/v15073

Base +27, =0w0= +5, draconian196 +9, zinos6 +8, Rolled +6

[140411] [毛玉ケヰト] [ディーゼルマイン] 清楚なJ○に媚薬まみれのチ○ポを即ハメしたら俺の精液便器になった!
http://www.getchu.com/soft.phtml?id=808254

Base +23

Character Files:
https://e-hentai.org/g/807835/c96a61ac65/

Base +25, newguy2012a +10

(同人ゲームCG) [140411] [ディーゼルマイン] 清楚なJ○に媚薬まみれのチ○ポを即ハメしたら俺の精液便器になった!

Base +7