Its in a way realistic. People do stupid shit when panicking, speaking from experience. Drugs are common in that way. The vn isn't bad cause drugs, it's good cause it doesn't shy away from the shit that someone like Rune would be going through and doing as a result.
Same with how Torulf is genuinely awful in more than one way but is still there. Arvo is another realistic character in that, when faced with the Mikko/love situation, he doesn't have the words and freezes which is common too. This is by far the best combo of wholesomeness and terribly realistic shit you obviously don't think about often (no offense). It's what makes this vn a good one in my opinion.