|Probably it's not Tomodachi Gokko (MOMOCHI Reiko), but at least there are a few similarities ...
Spoiler (mouse over to view)
The main character transfers to a new school, where she is meeting a childhood friend again, which is getting bullied. Although she can save her friend, she ended up all alone and becoming the new target. Because of this she kills herself - and gets a second chance (maybe for revenge? I'm not sure yet.)
"It's like love is a bonus in your life. Even without it, I'm just fine. I don't feel like pointlessly searching for it. You don't have to make yourself unhappy." (Ookami Shoujo to Kuro Ouji)
"Dreams, we say ... If you quit, then it's over. If you never give up, there will always be another chance." (Yume Miru Taiyou)