I think it looks like the Japanese gay couple I saw on Youtube? They also had a ceremony on Buddhist shrine.
Ok, quick follow up! The name of the activist (Nanasaki Ryousuke) is not the same one from the video o: if this is what you meant: https://youtu.be/dvPNiqH2DUU
This one is sooooo wholesome. Sooo good.
Ready need more manga like thissss