Happiness truly does not last long so is this love of mine. No matter how much I love them, it was easily broken down just because she appeared. Kuroko Tetsuya is a young omega man who has an amazing partner like Kiseki No Sedia. Everyone was jealous of his perfect and happy love life. Kuroko was happy every day as he entrusted his life with Kiseki No Sedai and the happiness he holds on to. Kuroko thought that nothing can break the love and happiness they have for each other apart, but it all begins to slip away as she comes in between their lives.