Main Story(*Note: Special Thanks to Aiko for sending me this Walkthrough!
To fully grasp the story, I recommend to read the "In Demand Route" first and to choose all of Seiya's options.)
Change the subject.
Make a self-deprecating joke.
About your job.
Turn him down. You have plans with Seiya.
Quietly wait and see what he does.
Invite him to eat lunch with you.
Pick up right away.
Pour his beer for him.
Send a cheerful sticker.
Wait for him to kiss you.
Scoot down without saying anything.
Tell him you're not interested.
This can't be good. Say, “No.”
Check out the taxi situation.
Talk to him.
I'm so happy to hear that.
Force yourself to put on something cute and go.
Super Happy End