Baka failed his physics test at school! He begs and pleads his professor to bump his grade up from and F to a D, but at first the professor rejected Baka’s pleas. However he eventually gave in and told him that there was an alternative. That alternative would be to fill in for him as an elf at the mall, where his Sister-in-law and her husband do a charity bit dressed up as Mr. and Mrs. Claus.
http://www.hentai-gamer.com/index.php?page=game&g=25bd81a6e6fc33337e37ffa2de453e9c