Himawari is a transfer student from Onigashima to a junior high school in Tokyo. She is a naughty and mischievous girl.  She is basically the type who goes her own way without worrying about others. Of the three, she is the most skilled in household chores such as cooking, cleaning, and laundry, you name it, and she can do it.

Over the centuries, oni (AKA demons of Japanese folklore) got a pretty bad reputation. Now it’s up to three plucky oni kids — sunny Tsutsuji, cool Tsuyukusa and boisterous Himawari — to improve human-oni relations through love, friendship and superpowered underpants!
 
(Source: Sentai Filmworks)
 
Note: Aired in 2 versions, a 60-episode 3-minute short series, and a combined 12-episode 14-minute TV series with the same content. Each episode of the combined version is 5 parts of the original.