Stop me if you've heard this before. Our hero is a young student who is close to four cute girls: a large-chested president of the calligraphy club, a young girl who is 1/4th English, the MC's classmate and close friend, and the MC's little sister.

One day, after the five cleaned up a mess in the calligraphy club, the MC came across an unsigned love letter directed to him. The MC is thrilled, but notices that the only clue to his secret admirer is the pair of unused panties left with the note.

Can the MC find the woman whose hips hug the panty snug? Will the MC actually confess to any of these girls, or will he just chicken out and enter into a generic noncommittal harem ending? Is the MC's sister really blood related? All of these questions will most likely not be answered due to the fact that the author has every incentive to keep this series running as long as possible and we have no clue how long we'll get translations for the chapters, but screw it you've likely already read the first chapter by the time you read this, so might as well enjoy the ride.