After the failure I♥B experienced in their latest live performance, they've dedicated themselves to practicing. When a senior IChu unit, Lancelot, appears before them, I♥B performs a song perfectly at their request, but the word that comes out of Issei's mouth is one they never expected.
like it was painting a rainbow in my heart
وكأنه يرسم قوس قزح في قلبي
so als würde es einen Regenbogen
in meinem Herzen malen.
Y es como si un arcoíris
apareciera en tu corazón
Un arc-en-ciel est né
dans nos cœurs
come se stesse disegnando 
un arcobaleno nel mio cuore
como se estivesse pintando
um arco-íris no meu coração
словно хотел нарисовать
радугу в сердце.