Undertale - The Echo that once was

Reminiscing about the past should always be about laughs, nostalgia and joy, sometimes sadness. Atleast, that's what Asriel Dreemurr used to think, before his sister ended up shaking him to his core. To Chara, her brother is going insane. Perhaps it's the truth... but when you can't trust your own memories, then who can you trust?