What is the connection with the Gundam SEED?

In the aftermath of the Recombination War, some scientists have created a kind of enhanced human through genetic technology that surpasses ordinary humans in all aspects, known as the Coordinator. Later, as a result of the emergence of Evidence 1, the prestige of the religious community collapsed, and people gradually accepted the special existence of the moderator. As a result of the conflict between the adjusters and the natural persons on all sides, after a long period of planning, the opposition between the "Zaft" consisting of the adjuster satellites and the council members investing in the construction of the satellites became increasingly apparent, and finally, after the sustained small-scale attacks of the Zaft.

On February 14 of that year, the Earth Army launched a nuclear bomb at the agricultural satellite Denius 7, destroying it, known as "Blood Valentine" (Aslan's mother, Renoah. Sara was also killed in the incident, and Aslan joined the army). After that, the two sides abandoned all diplomatic efforts and began military operations, and a tragic space war broke out.

A year after the start of the war, a battle broke out on the neutral resource satellite nation of Heliopolis [belonging to Orb], and in order to capture the new high-performance mobile suit "GUNDAM" secretly developed by the "Atlantic Federation", the mobile suit unit of the Zaft army raided the United Earth Army. Due to the well-planned and swift action of this risky military operation, the United Earth Army was caught off guard and snatched 4 of the 5 new ** Gundam of the Earth Army.

Kira and her friend Aslan are new human teenagers living on planets, and they have lived together since childhood, sharing the same hopes and dreams for the future. Aslan later joined the Zaft army and became a mobile suit pilot. Aslan was also a member of the operation.

At this time, Kira was still a student at an industrial school, and in order to protect his relatives and friends from the Zaft army, he took advantage of the chaos to board the "Strike Gundam" that had not been stolen and began to embark on the journey of war.

There is no prequel.

Seed is not a UC calendar.,Compared to the orthodox Gundam story, it's a side story.,Of course, there's no prequel.。

The ones you ask will be said later in the plot.

No, Seed is completely original, and it doesn't connect with the previous Gundam series at all, and even the world view and definition of new humans are different.

There is no prequel, but there is a mention of Mou La Flagg in the PS2 game (Gundam G Century CE) about how he survived the Zaft raid on the lunar base and was known as the "Eagle of Antimion". I suggest you take a look at Astary (it seems like that's how it works, Khan ......This is a manga of the nature of a gaiden that complements seed

You can refer to the following Gaiden. There is no case when the main story is spoken.