Freya

She provides a love letter express service named "Mystery Express" during Valentine's Day. Every Valentine's Day she provides a love letter express service to help shy students express their love. One day, she noticed that the recipient of all the love letters was Senpai. This caused her to gain interest in Senpai and eventually she fell in love with him. This year, Senpai once again is the most popular recipient of love letters. However, there is only one letter in his locker on Valentine's Day! Where are the other letters? Who wrote the single letter? This is the story of Freya and Senpai...