Manga by author Saitou Ken

A girl saves Houjou family's third daughter from drowning herself. The girl takes her place as Houjou Ran who shall become the Tendou family's bride but her deceit is seen through..?

Hanazono is feared due to his grim reaper-like face. However, college student Suzuka Hiyori confessed to him and they started going out! While Hanazono is pretty much bewildered about it, seems like Hiyori is the only one who notices his "real face."