  We realise the Shatashvili-Vafa superconformal algebra for $G_2$ string
compactifications by combining Odake and free conformal algebras following
closely the recent mathematical construction of twisted connected sum $G_2$
holonomy manifolds. By considering automorphisms of this realisation, we
identify stringy analogues of two mirror maps proposed by Braun and Del Zotto
for these manifolds.
