第 12 集: Ruri在祖父的遺物中發現了一台晶體收音機，並嘗試與朋友們一起組裝。

12

Among her grandfather's old things, Ruri finds a contraption of copper wires and crystals. Nagi identifies it as a crystal radio. Ruri, Shoko, and new friend Aoi try to recreate it, but struggle to find the right mineral for the detector. A germanium diode works, confirming the build is correct. A nearby shrine with connections to Ruri's family offers better reception. (Source: Wikipedia)