You can send mail your "Yome" more quickly!!"Yome" means lovely girlfriend in Japanese.
If you input "Yome"'s profile once,You can send mail and call your "Yome" without input mail address or phone number.
Volume up and down button is smiley button.You can input smiley quickly.
Camera button is send mail button.
You can change "Yome"'s picture and background image anytime, and you can change mail address and phone number in Impure heart varsion.