User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-37165251-20181209183528/@comment-36663391-20181210135933

@ Grandpiece I believe that until the figth with Balberith Issei will don't get another power up like the Amrita or Ingvild's song. I think that the next step for Issei should the awekening of GR's power, also at this point the Amrita and Ingvild's song could have make stronger the influence of Ophis and Lilith on Issei's soul. My 2 reason for said this: Chichigami said that the oppai's power of Issei is becoming divine and when Ingvild boosted Issei he said that feel a power by his inside. So my theory is Ingvild's song help the dragons to use their inside potentional like Ophis's blessing don't give to they a true power up. When Issei with GR's power and Balberith figths the song Ka Ka Ka Ka Kachi Daze will started to play XD.