Souda Bakkure You Dorei Kattara, Zense no Joushiki toka Rinrikan toka Doudemo Yokunatta

Stella is reincarnated with memories of her past life, in which she died from overwork. Influenced by these memories, she was hailed as a child prodigy and began working at the Ministry of Magic at a young age, but before she knew it, she was 18 and just an ordinary person. Her workplace, the Ministry of Magic, is so exploitative that she is forced to work 15-hour shifts for 29 consecutive days by her abusive boss, and is subjected to unfair harassment from her colleagues like Millicent, wearing down her mental health day by day. "I'll die if this continues!" she thinks, and has the idea to buy a three-dimensional (slave) to find solace. Stella acquires Elias, a tall and handsome slave, but where exactly does the service under a slave contract begin and end—!? A romantic fantasy of love and a slave contract!

(Source: Rimacomi Plus, translated)