The opening bit with Sanae explaining which of her moms tops the other is amusing (seems they switch, good for them), but the theological implications of Kanako intentionally syncretizing a pre-existing husband with Suwako are actually intriguing, considering how gods in-setting are shaped by belief.
To follow up on this (you personally may or may not know, but it's a fascinating topic):
The two main gods worshipped at the real life Suwa Grand Shrine are named Takeminakata (husband, also known as Suwa Grand Deity) and Yasakatome (wife).
Kanako is obviously named after Yasakatome, but takes most of her role and backstory from Takeminakata, who in the version of the legend that ZUN is obviously using invaded the Lake Suwa region and conquered it from its native gods, including one named Moriya (represented by Suwako).
This means that Kanako basically represents both sides of what in real life is a married couple of gods, while Suwako is the native god she secretly kept around. Various Touhou authors have done different takes on this, but here with risui the implication I choose to get is that Kanako is mostly Yasakatome, while Takeminakata got the credit for Kanako's work (being the man) only to end up syncretized out of the equation (because he was disturbing the yuri, I guess).
last edited at May 28, 2025 11:01AM