Himawari is spending time helping Chinatsu with her Valentine day gift, but Sakurako feels like a pain when Himawari is not around checking her homework.
I put a lot of effort into making 
your chocolate, Yui-senpai.
Me esmeré mucho preparando 
tus chocolates, Yui-senpai.
Me he esforzado un montón preparando tu chocolate, Yui-senpai.
Eu me esforcei bastante
 nos seus, Yui-senpai.