Natsuzora no Monologue Portable

In the seaside town of Tokijima, a strange tower called the Tree appeared thirty years ago and caused a brief national sensation before becoming a forgotten landmark. Ogawa Aoi, a student in the local science club, has never thought much about it — until the club is scheduled to close. On July 29th, the day before the closure, all the club members visit the Tree together. At that moment, the Tree begins to sing. July 29th begins again.