The bethrothed are to tie the knot. The newlyweds' fingers are bound together by a red rope, symbolizing that their destinies are now bound forever.

a rope, a flexible, heavy cord of tightly intertwined hemp or other fiber

tie (a string, rope, sash, etc.) / connect / be bound (by love, friendship, etc.) / enter a contract, form an alliance / wrap up, wind up / conclude, end

a shrine, especially a Shinto shrine

a town in Watarai District, Mie Prefecture

a shrine, especially a Shinto shrine

past tense and perfective aspect of 結ぶ (musubu) [godan]

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

rope