Things would have been different if he had met her back then. That was what Hayama Hayato claimed. Would Yukinoshita still become as cold and reserved? Or was Hayama right? Things would end up differently, but not just for her.

Hikigaya under certain circumstances is alone again. But as always, someone... somewhat... somehow finds a way to break this solitude.

Hachiman just left the Aquarium Park after the Valentine's 'date' and is on his way to pick up his sister. His mind is filled with troubles. Yukinoshita's request, the survival of the Service Club, Komachi's entry exam and his desire to find something genuine. Illusions and changes will walk together with him through this snowy evening and his high school life in the days to come.

Valentine's Day - a day of love, pink, and chocolates. In the spirit of the coming holiday, Hiratsuka-sensei gives her Modern Japanese periods an assignment: write a love letter. So naturally, Hikigaya writes a love letter to the person he loves the most.