Yui is a straightforward and energetic 2nd year middle school student. She has outstanding physical drive and gets hungry quickly. Yui cherishes her grandmother's motto, "food is smiles". She also likes doing her best to help others. She has a tendency to be absent-minded, often mis-quoting idioms or phrases, and is rather oblivious about anyone's romantic feelings towards her. When Yui is worried about something, she becomes incredibly hungry, and won't stop eating until she has resolved the is