No, ChaCha, sorry for being confusing. The part with the Makikyuu X drug and G-Akiha is in the Visual Novel segment of the 3rd game "Melty Blood" (obviously), and not in the first game "Tsukihime". They're all Visual Novels, it just so happens that Melty Blood's Visual Novel is based around fighting instead of selecting choices to determine your path through the story.
As for the I-Raf-You doujin:
http://eng.dlsite.com/work/=/product_id/RE014688.html