Plastic Tree for me, ALWAYS. They were the band of my teens and basically the band that saved me through my dark days. Andro Metamorphose is all too beautiful, both musically and lyrically, but tracks like Dona Dona, Sanatorium, Thirteenth Friday, Yume no shima, 37C, Spica also move me very deeply. But obviously, I'm missing a good number of their songs here. In my later high school years I found bands like THE NOVEMBERS, envy, and Mono. For THE NOVEMBERS I love their whole To (melt into) album and my favorite is はじまりの教会, but when 今日も生きたね came out I lay down and listened to it forever and it was the song I went to when I needed it.
I like a lot of songs by envy. A cage it falls into, Incomplete, the split they did with Jesu, and basically their Recitation and Insomniac Daze album. I can listen to them passively, but still feel something emotional from them every time. I can say the same for Mono too. But for sure, completely healing music from two great bands.
edit: goddammit, i'm missing a lot of other good bands, but whatever those are my tops.