Watashi wo Korosu Gitei wo Rourakushiyou to Omoimasu

After clashing with her stepbrother Filio over the throne, Lea is executed by Filio's hand - and when she wakes up, she finds herself reverted to being 15 years old! In order to avoid any conflict this time, Lea intends to win over her stepbrother and make him her ally, but instead she finds herself becoming obsessed with Filio, wanting to have her stepbrother all to herself.

He's supposed to be her cute stepbrother, but it seems there's more to him than just his sister complex that Lea doesn't know about...

(Source: KADOKAWA, translated)