"Thank you for everything until now!" As the cold winter comes to an end and warm spring approaches, the graduation ceremony of Renge's older brother, Koshiya Suguru, who was in the third year of middle school, has arrived. Even though it's graduation, Suguru feels no different to Renge since he is still her older brother living in the same house. Nevertheless, Renge wants to properly greet him on this special occasion, so she says her greetings to her brother once again.