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Len'en (鏈縁 or 連縁, lit. "Connecting Chain") is a series of vertical danmaku shooting games made by JynX, set in the land of Mugenri. Although inspired by Touhou and Seihou, the games are not Touhou fangames. They are set in a separate world featuring an entirely new cast of characters.
Also of note is that while in Touhou the characters are all female, in Len'en the characters' genders are generally left ambiguous. It is likely that their genders will never be revealed, and that it will simply be up to the player's interpretation. Most of the characters have names that reference birds.