Seems like an official compilation of previously available sets :( I was hoping for at least one new image, but no, it just the old stuff. Still, it's great quality. Shame the circle seems defunct.

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DL:
not on JPN site?
http://www.dlsite.com/ecchi-eng/work/=/product_id/RE041523.html

Mugi:
?

Circle website:
http://www81.sakura.ne.jp/~morihama/

If you want to see more Gurren Lagann content support bounties
https://e-hentai.org/bounty.php?search=Gurren&t=&s=

E-hentai tip of the gallery:

6) Compilations are not allowed. That means galleries that contain multiple dojins, mangas, cg sets and such will be expunged and replaced by galleries containing only one release. This included galleries mixing languages. On the other hand, this rule does not affect official releases, such as dojins that are official, circle releases of their previously published works), which are allowed.

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We are always recruiting editors, translators and proofreaders for EHCOVE. If you are interested, come by the Cove of Translators in the forums and introduce yourself.-hentai.org/exchange.php?t=hath