Game World Reincarnation

After dying at her desk from overwork, an office lady wakes up inside the otome game she used to play on her lunch breaks — except she's not the sweet heroine. She's Diana, the villainess who's supposed to get dumped and humiliated by the end of the story. The catch: her fiancé is Prince Sirius, the game's most desirable love interest, and she very much wants to keep him. Unlike most isekai protagonists who stumble through their new lives, Diana knows exactly how the plot is supposed to go — and she's not interested in following the script. The story kicks off with her first night in this new body and a fiancé who's already very attentive, which sets the tone immediately. This is an 8-episode ONA from Studio Hokiboshi adapted from a web manga, and it leans fully into its adult content — the romance here is explicit, not implied. If you're into the villainess-reincarnation premise from something like I'm the Villainess, So I'm Taming the Final Boss or The Villainess Is Adored by the Prince of the Neighboring Kingdom but wanted those stories to go somewhere steamier, this scratches that itch. The isekai setup is familiar, but having a protagonist who's genre-savvy and determined rather than passive makes the dynamic with Sirius genuinely interesting beyond just the explicit scenes. Go in knowing what it is, and it delivers.