Yay! A Shizuha and Minoriko doujin! I'm dying to see those~ After all, they were featured as the MC's in this doujin, not a running gag...

...

Also, Shizuha is the older sister and the goddess of autumn, right?

They are both goddesses of autumn.
Shizuha is older sister and goddes of red leaves.
Minoriko is younget sister and goddes of harvest.