Sono Ai wa Yamai ni Itaru is the second volume in Operetta’s『耳で感じる乙女ゲーム』シリーズ (literally, the otome game series which you feel with your ears). It has multiple endings with either guy and taking note that the cast uses their pseudo-names, you can expect it to have R-18 content. Also if you guess from the drama CD title, you should expect some degree of…extreme behaviour lol. I don’t mean to turn people away though ‘cos I actually did enjoy this drama CD.
This follows the Common Route of Toya, Luji and Uru. Luji is a doctor and also helps Toya with his research. Also, the character I was interested in from the start so don’t be surprised if my post looks biased lol. R-18 game! But I will not post any R-18 CGs in my reviews and there will be spoilers.