To date, there are seventeen volumes in the True Tenchi Muyo! GXP series of light novels. Volume seven was written by Masaki Kajishima to augment events around episode 12 of the anime. It is unavailable outside of Japan.
Another pirate fleet descends upon the Kamidake. But without warning, most of their ships suffer heavy casualties. The attack is routed, and as the pirates flee into hyperspace, Seina pulls some maneuvers.
Because of the recent rescue of the GP operative, the Kamidake must lay low on Jurai for a while to avoid many factions sniffing about. This leads to Ringo requesting Ryoko Balta to spy on them, as their guild cannot afford to send anyone else to Jurai proper.
On Jurai, Hakuren asks Kiriko to escort Seina while the crew of the Kamidake receive a royal welcome. Before long, a misunderstanding happens, in which Seina is confronted with a choice: battle Hakuren over custody of the girls, who are currently dressed in maid attire.