Official Trailer with Theme Song Released for New Anime "Firefly Wedding"! OP Theme Announced as iri's Original Song "Period"

The official trailer and opening theme song details for the TV anime "Firefly Wedding" have been unveiled.
The newly released trailer begins with the fateful encounter of two people whose paths were never meant to cross: Satoko Kirigaya (VA: Lynn), an earl's daughter striving to live fully despite being diagnosed with a short life expectancy, and Shinpei Goto (VA: Koki Uchiyama), a legendary assassin hired to kill her. The footage showcases Shinpei's unhinged affection through lines such as, "My love might be a bit heavy, but I'll make you happy," and "If I were the last man on Earth, you'd have no choice but to marry me, right?" along with turbulent developments involving the two protagonists, building high anticipation for where this story of mystery and obsessive love will lead.