Anyway she gives her panties that are very resistant to everything except spears... Please tell me that this is a reference that i didn't get and that "spear" is not what i think :\
About the bad ending, other then the disturbing Hina making sex with everyone, i don't like the death of Toko, ok honestly i cheer for her to be with Byakuya, but imo it would have been a way better ending with Toko and Byakuya together.
Did she suicide because Byakuya was the first to go with Hina(his son seems to be the oldest)?
For the first, I can't see how to take it any other way, heavily implied that she loves the D.
Edit:
Her fatal weakness is the Spear of Gunguir.
Oh snap! Clever clever, went right over my head then.
For the second, I found Toko to be annoying so I like to think that Byakuya is smiling so much because he doesn't have to deal with her anymore (and not an ounce of remorse was given that day for that bitch was a serial killer) but I think we have to conclude that she died of natural causes. If she had committed suicide, there would have had to have been a class trial which was not the case according to Makoto. I think we are supposed to infer that Byakuya had the kid with Toko and Hina is just taking care of him because of motherly instinct or something because why else would Byakuya be the one holding the portrait. In the end, it doesn't even matter anyway, the bad end was obviously just some weird fantasy thing that Makoto made up in his head during the trial while day dreaming.