we see (Y/n) as he stares off into space before he turns around and looks at the 4th wall as the title appears in the sky made of stars..

'BIG'

Mada toke kirezu ni nokotta

we switch to the class as they all train and relax for their next battle as we see (Y/n) having his Kurosubasutā as he holds two cards but who's on them isn't shown as eri hugs his leg.

Hikage no yuki mitai na
Omoi wo daite ikiteru

he smiled at eri as she suddenly changed into his Original self before returning to Normal.

Nee, boku wa kono koi wo
Donna kotoba de tojitara ii no

Issei was in His Balance Breaker carrying random supplies as Koneko carried some stuff as well.

Anata no subete ga ashita wo nakushite

Eien no naka wo samayotte iru yo
Sayonara dekizu ni tachidomatta mama no
Boku to issho ni

It shows the Class practicing Music for something as Jiro suddenly ran through with a guitar case.

Mada tokenai mahou no youna
Soretomo noroi no youna
Omoi nimotsu wo kakaeteru
Nee, boku wa kono machi de
Donna ashita wo sagaseba ii no
Ah-ah

Many members of The class are shown making a Candy Apple using their Metahuman abilities before it Bonks (Y/n) on his head as he caught it and smiled before giving it to Eri.

Anata no subete ga katachi wo nakushite mo
Eien ni boku no naka de ikiteku yo
Sayonara dekizu ni aruki dasu boku to
Zutto issho ni

the Class all smile as Eri stood in the center being Held By (Y/n) & Yagyu as it zoomed in on her before she smiled at the 4th wall.