From the Slash Pile: "They have 25 lives, and they are still searching for each other."
From delicious.com: "Incredibly beautiful illustrated story about two lovers that meet across time, and sometimes they know each other and sometimes they don't, and sometimes they are friends and sometimes foes, but one of them is always in love with the other."
From http://tvtropes.org/pmwiki/pmwiki.php/Main/ReincarnationRomance: "Shousetsu Bang*Bang has a short comic, 25 lives, about a pair reincarnating again and again. No explanation is given, and there are lifetimes when one kills the other, or one doesn't exist, or they just miss each other."
This comic has become a template for other fandoms, and many versions can be seen at the '25 Lives' Tumblr tag.
A podfic version can be found at http://yungichang.tumblr.com/post/94468178958/note-you-can-also-listen-download-here-if.
A video version is available at https://www.youtube.com/watch?v=AB8PYVsmHKc .
This is from the newest issue of the bb_shousetsu, which came out this night, it's the first thing I read from this issue and it's so beautiful. You should all go and read this, right now; seriously! It doesn't take much time, like two minutes, although you might want to reread it several times and then again some more - you don't want to wait and you definitely don't want to miss this. Touching and lovely, and the text is perfect, as are the pictures. Very lyrical, and a bit sad and hopeful... it's going to make your heart ache.
- pinboard.in: "I don't really know what to say about this, because it kind of transcends words. After I finished reading (which took me a while, since I kept getting distracted by the pretty art and having to go back and start over), I was both speechless and teary-eyed. It's a gorgeous work of fiction, art-wise and prose-wise, and there's so much in it that you really can't help but re-read it over and over."