yes they are connected. sigrid is a character there and you might remember veramude, he's in this one too! this story happens before sica wolf, and I dont really remember if this one influences anything in sica wolf since its been a while since I read it. personally I like this one more, though I also really liked sica wolf. I hope this answers your questions :]
The male lead from Sica Wolf is introduced in the side story for Sigrid. He stays quite a while in Sigrid’s estate. He and Veramud seem to have a tight bro relationship prior to his appearance in Sigrid.
SO~ I read Sica wolf not TOO long ago, but I have been on the fence about reading this... pretty sure the FL is a side character in Sica Wolf, and like as of Sica Wolf which I THINK takes place later in the timeline, she's with a certain ML... but idek... is this as good as Sica Wolf? And does That story play any part in this one? And a whole bunch of other questions...
Sorry (〜￣△￣)〜