Stopping by his hometown of Karasuna, Gareki runs into his old friend Tsubame, who asks him to help uncover the truth behind a string of murders that have recently been plaguing the town. Though the crew assumes that the murders were the doing of their mutant quarry, they catch Tsubame's younger brother, Yotaka, red-handed at the scene of the latest crime. Ordering the bewildered Nai and Gareki to escape, Yogi prepares to do battle with Yotaka, but this is one fight that can only end in heartbreak for Gareki...

Two boys seek to unlock the mysteries of their past within the lush pages of the manga that inspired the anime.

The battle at the base of the Mermerai mountains draws to a close following the entrance of the silver-haired Yogi. However, even after the trouble ends, Silver Yogi refuses to revert to Yogi's normal self Aboard the 2nd Ship, Nai awaits Gareki's return...Later, a visitor turns up at Uro's door--Azana. Though his thoughts have remained with Dr. Akari, Azana has been working under Uro to further his research on Varuga. Meanwhile, back on Hirato's ship, Karoku reveals a shocking truth about the mysterious notebook he left behind in the Rainbow Forest. What secrets do its pages hold...?

At Yanari's party, Nai and the crew deepen their friendships and experience the warmth that comes of supporting and encouraging one another. Upon their return to the 2nd Ship, Gareki is summoned to meet with a stranger, who has come aboard disguised as a tree...?
But back at Chronome Academy, Kafka launches an attack, sending a swarm of Varuga to lay siege to the prestigious school. And when Tsubame attempts to protect her friends...she ends up a hostage herself With Gareki back on board the 2nd Ship, who will come to her rescue?

(Volume 7)
At Yanari's party, Nai and the crew deepen their friendships and experience the warmth that comes of supporting and encouraging one another. Upon their return to the 2nd Ship, Gareki is summoned to meet with a stranger, who has come aboard disguised as a tree...?
But back at Chronome Academy, Kafka launches an attack, sending a swarm of Varuga to lay siege to the prestigious school. And when Tsubame attempts to protect her friends...she ends up a hostage herself With Gareki back on board the 2nd Ship, who will come to her rescue?

"Gareki comes face-to-face with the silver-haired Yogi in the darkened halls of the ship. Despite his attempts to get to the bottom of Silver Yogi's enigmatic words and to discover the truth behind this personality, Gareki is instead drawn into a dangerous game"--Publisher marketing.