It's yet another way someone is making fun of Reimu's financial situation.
Yukkuris are being typical home invasion shit heads and Reimu then laments on how that was her last bit of food, leaving the yukkuris to apologize in the last panel
Really... Sorry...My... onigiri cracker...I'll eat gobble up this amount of food easyEven though... since a week ago I put it away to save it it to treat myself later...*Sorry for being so cute*This is Reimu's (and Marisa's) yukkuri place!!Big sis should hurry up and leave!!