this seems to be eripon's designed b-day t-shirt
translation from sefrris
The front says:
I <3 Kaichou (president, her new nickname)
the most in the world
Eripon cheer team
I love love love her the most
The back says:
Ikuta Erina
Super ultra hardcore support only for her
and the 2119 probably stands for her and risa since 2=ni 1=i for 21 and 1=i 9=ku for 19 so nii(gaki) and iku(ta) if this makes sense LOL
i want this shirt ;3;