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.
You must be lonely without Himawari-chan.
Te debes sentir sola sin Himawari-chan.
Tienes que sentirte un poco sola sin Himawari-chan.
Você deve ficar 
sozinha sem ela.