Koutaishi to Kon'yaku Shitara Yomei ga 10-nen ni Chinji nda node, Nazo Toki Hajimemasu!

Chaliaze, who can see the remaining life expectancy of herself and anyone she touches, signs an engagement vow with the Crown Prince, but her life expectancy, which should have been of 70 years, is reduced to just 10!? When she tries to take steps to dissolve the engagement, it turns out that not only her own life expectancy will be reduced, but that of her relatives as well... Now she has no choice but to find a way to get her life back while remaining as his fiancé!