After a long wait, your wedding day with rin finally arrived, but after you and rin were declared husband and wife, an unknown person shot rin right in the chest which caused rin to be on the verge of death.

Rin:"Run!...my love.."

and who would have thought that the one who shot Rin was her own brother, Itoshi Sae.

Sae: "shh..shut up itoshi rin.."

The second shot was fired at Rin's head and Rin died at the hands of her own brother, Itoshi Sae.