I was actually looking for SE spoilers when I saw this, but I'll try to give what I think of as an example.
There is a shoujo/shounen-ai anime/manga that I've picked up, titled Uragiri wa Boku no Namae wo Shitteiru (I THINK that's the right spelling) translats to The Betrayal Knows My Name and shortned by fans to Uraboku. It's about a bunch of people who have spent lifetime after lifetime fighting duras (demons) led by a half human half dura who keeps reincarnating himself after each battle to continue to fight on, since he's never been defeated yet. The main character is the only one who doesn't remember his past reincarnations, but all the others do but are torn between telling him and letting him find out on his own. There's more to it, but I dont want to keep rambling about it, so if you want to, check out the anime/manga (NOTE: the manga is only translated up to chapter 21, so after that you would need to find Raws or i know chinese scan sites).
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There is a shoujo/shounen-ai anime/manga that I've picked up, titled Uragiri wa Boku no Namae wo Shitteiru (I THINK that's the right spelling) translats to The Betrayal Knows My Name and shortned by fans to Uraboku. It's about a bunch of people who have spent lifetime after lifetime fighting duras (demons) led by a half human half dura who keeps reincarnating himself after each battle to continue to fight on, since he's never been defeated yet. The main character is the only one who doesn't remember his past reincarnations, but all the others do but are torn between telling him and letting him find out on his own. There's more to it, but I dont want to keep rambling about it, so if you want to, check out the anime/manga (NOTE: the manga is only translated up to chapter 21, so after that you would need to find Raws or i know chinese scan sites).