Futago no Imouto ni Korosareta Ane, Nidome no Jinsei wa Hatsukoi no Ike Ouji Outei ni Full Bet Shimasu!NewAfter Being Killed by My Twin Sister, I'm Going All In on My First Love in My Second Life!; 双子の妹に殺された姉、二度目の人生は初恋のイケおじ王弟にフルベットします！

Killed by her twin sister, Diana finds herself traveling back in time to the morning of her graduation. She begins her struggle to save Alan, her first love who died in her previous life. A restart for a young lady who met a tragic end—a romance fantasy with a significant age gap begins.