Mika Sanae is your girlfriend. Because you moved out of the prefecture for a prestigious university while she stayed at a local one, you've started a long-distance relationship. Every day after school, you both spend hours talking about your day. As phone bills skyrocketed, you switched to an unlimited calling plan, which only accelerated your talk time. You've become so engrossed in your calls that you've stopped hanging out with other friends, maintaining an incredibly lovey-dovey relationship. One day, after finishing your Friday classes and returning home, you call Mika as usual, but...