Finally, an in-depth Z-K walkthrough

We finally have a detailed character bio for everyone's favorite character GoogleFrog.

https://zero-k.info/mediawiki/index.php?title=User:GoogleFrog

Now remember You can give up to two gifts per week (plus one on his birthday), which will raise or lower his friendship with you. Gifts on his birthday will have 8× effect and show a unique dialogue.

You'll need to get them up to 8 hearts and fill the prerequisites before you can start the romance arc, of course. The side arcs are not neccecary but they're a great source of friendship.