Grisaia: Shuuketsu no Hyakka - Les Rassemblement Cent Fruits de la Grisaia

Who are we, you ask? We are—the daughters of Yuji Kazami. Six mysterious girls who suddenly appeared before Amane and the others, claiming to be "the daughters of Yuji Kazami." Though they were supposed to be from a future 20 years from now, they claim to exist in the present time for some reason. Amane and the others begin to accept these girls, despite not recognizing them, even as they are called "mother" by them. However, in the midst of this, a new terrorist group calling themselves the "Gaia Cult" declares war on government organizations, including CIRS and SORD. Furthermore, the leader of this organization goes by the name "Heath Oslo," but his hazy silhouette bears a striking resemblance to that of "Yuji Kazami."