Koichi Natsukawa walkthrough

I made a walkthrough if you can't get the Happy ending,but exploring it yourself is much more fun ^^ but if you really don't get it then here is the walkthrough

A. Try starting a conversation
A. Thank you
C. He's a nice guy
B. I was looking for you
C. I'd like to spend it with you
C. You're being selfish
A. All right
A. I want to believe those feelings
B. That's not it
A. Thank you

A. The beginning of a second life
A.  Yeah...
B. Romantic fulfillment
A. Stay with me
B. You're like a child
B. What a novel idea

A. Stop it, I don't want to hear it

A. He's my supervisor

A. You're pitiful

A. All right

A. Don't jump to conclusions about me
A. Of course I care
C. They're so good ,though
A. It's not
B. That's not true
C. You don't have to deny it so strangely
B. Hmm...
B. Jealous?
C. Same here

A. Of course I'd stick with you

C. Because I decided to stick with him
B. That would depend on the stock