User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-39089654-20190917054047/@comment-2208155-20190917080753

I found it.. Lint SIGNAL in shin 1.. I added it few days ago:

“Issei:…Ingvild is singing…a song about me?”

A moment later—. Rias’ chest glowed. But it didn’t stop at Rias. Asia, Akeno-san, Koneko-chan, Ravel, Rossweisse-san, and Elmenhilde’s boobs also started to glow. Pillars of light began to rise up from far away.

And over there…'''Xenovia, Irina and Lint-san? The songs could be heard from the girls’ boobs, and now they’re glowing! The song continued.'''

'''That song — she was singing about herself and us. So she can not only sing about herself, but also what’s on other people’s minds…?''' As I thought that way…

After this and watching SHIN 2. "Rias losed but I will continue living here." This won´t be the last time that her boobs are involved in something related with Issei. Thanks to Irina the angels should not be transformed into fallen angels if they want to be with a devil.