Masato is a personal butler of Yuna. He works hard for her, but he is actually in love with her. One day, he sees her wearing wedding dress and realizes; "Oh, she is gonna marry some day...".

Days later, she tells him "There are lots of people to replace you!" when he makes a mistake.

There he swears to himself, "OK, I'll show you. I'll do whatever is necessary to get you...".

[Edited from ErogeShop]