Then we can have them printed and combined into a Tome, and we gotta get one more chapter for their 101st night, and we can call the Tome, 101 sexual nights
Following up on this, the information page credits as the artist as Edogawa Roman while the drop down header on the top of every page credits the artist Tsukitokage as of 01/28/17.
A 100th anniversary of having sex? Sounds interesting. I mean, the anniversary of getting together or marriage or something is quite normal, so I guess 100th night is the next logical step.
...And I suppose on the 200th night, something even more amazing awaits?