第 4 集: Sonico 收到一張神秘的明信片，喚醒了她國中時期玩搖滾樂的回憶。

Sonico gets a postcard from someone with no sender written. It seems to be from a tropical location, and there's only a few words printed. Sonico remembers her past. Everything started when she was into rock during middle school. She couldn't express herself honestly and with as much power as a rock musician, so she wanted to be like one. She finds a upperclassman who teaches her everything. (Source: Wikipedia)

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