Chuuken Bodyguard ga Nisemono Reijou no Uso to Karada wo Abaku made.

Volume 1
Reiko is reincarnated into the world of an Otome game as the daughter of a financial conglomerate. She tries to tame her dangerous and powerful bodyguard Takaomi... and avoid going down the bad end route that will lead to her death, but... he finds out that she is actually someone else reincarnated into her body. With her "lie" having been revealed... can the two now forge a new relationship built on trust...? "I'll behave well, so make sure to only love me okay?" Touched by Reiko's pure kindness, the Takaomi's heart is swooned... and now there's no hope in hell that she can escape from his sweet, yet passionate and obsessive love...!

Volume 2
After reincarnating into the world of an Otome game as the villainess daughter of a financial conglomerate family, Reiko was enjoying her school life without issue until...
suddenly one of the game's main love interests... the handsome and wealthy "Rihito" appears. To make matters worse, it turns out that in this world... Rihito is replete with utter adoration for the villainess that Reiko reincarnated as, and unfortunately... Has grown to become a rather obsessive ex-fiancé. He wishes for her to become the old selfish Reiko... and obstinately follows and appeals to her. Watching on as Reiko is pestered by Rihito... Takaomi's temper steadily becomes worse and worse... "No matter how kind you may be, you're way too friendly." Thus begins the rampage of a dog driven mad by jealous rage----...!?