YSS Kaiyō, NG-X1-440, is a Plumeria-class (2D) Medium Gunship built at Gemini Star Fortress by Ketsurui Fleet Yards in YE 38 for the star_army_of_yamatai's First Expeditionary Fleet in the 6th Squadron. She is commanded by Shosa teien_eden.

As of 7日 6月 YE 39, the YSS Kaiyō has been declared too damaged to continue use, and has been subsequently decommissioned and salvaged for parts. The ship's namesake was carried onto the YSS Kaiyō II.

This article is about the ship. For plot information, see yss_kaiyo.

The YSS Kaiyō attempts to dismantle the Kuvexians in their own space by venturing far from the Kikyo sector in hopes of finding their weaknesses and exploiting them.

Light in Darkness

Kaiyō means ocean and is the name given to this Plumeria.

Kaiyō Kaiyō you are a shining star
Kaiyō Kaiyō bringing us oh so far
A ship to brave the storms of space
A ship to stave off any disgrace
Kaiyō Kaiyō set your sights distantly
Kaiyō Kaiyō crush opponents abysmally
A ship to take on any force
A ship to set its own course
Kaiyō Kaiyō an ocean of wonderment
Kaiyō Kaiyō you are a raging torrent
Waves crash from your mighty hull
Your crew takes on duties in full
Kaiyō Kaiyō you are a shining star!

The following lists of events are in chronological order.

Built in ye_38, the YSS Kaiyō is a Plumeria-class (2D) Medium Gunship made to be within a small squadron of four Plumerias of the First Expeditionary Fleet, Sixth Squadron.

In mid-YE 39 (5月 YE 39), the YSS Kaiyo disappeared and lost contact with Star Army Command after attempting to rescue a fallen escape pod. The ship had been lost in an alternate dimension for over one month, using all of its crew and resources to get it back. However, the process completely ruined the ship's engines beyond repair, and overloaded the ships main aether reactor, blowing a hole through the side of the hull. The ship was found on 7日 6月 YE 39, drifting just west of the Ketsurui Military Sector. The ship and it's living crew were rescued and taken to the Gemini Star Fortress.

The YSS Kaiyō was deemed to be damaged beyond conceivable repair, and subsequently decommissioned and salvaged for parts. The Zesuaium hull was recycled to create a set of Kaiyo Swords, gifted to the ship's original crew. Now, the ships namesake was given to the YSS Kaiyō II, a Fuji-class Expeditionary Gunship.