At first, she appears to be cold. She did this because of the alleged problem student status the Protagonist has. However, after he stands up to Kamoshida, she becomes noticeably nicer. She begins to look after the protagonist and helps when he goes through palaces.
The Temperance arcana is the fourteenth XIV tarot arcana and can be unlocked on May 27th after going through with Ryuji's idea about the maid service. The confidant of the Temperance social link is Sadayo Kawakami. The Temperance arcana represents harmony and moderation. Through your journey, ranking up the Temperance arcana will provide you with assistance throughout your life so that you don't need to waste time doing menial tasks such as laundry. Much in line with the themes of moderation and orders, Kawakami will help you out with a variety of tasks. Kawakami is available a night by calling her from the Leblanc phone.
Most of the women available for romance in Persona 5 are your fellow high school students. But not all of them. This is all normal and expected for a Persona game. Persona 5 is different though. This includes dating them.
First introduced as Joker's homeroom teacher, Sadayo Kawakami quickly develops a cold attitude towards her new student with the criminal record. However, after Joker discovers a huge secret about her, the two decide to strike a deal. Here's a spoiler-free guide on how to max out her confidant in Persona 5: Royal. Beginning that night, Joker will be able to call Kawakami from the yellow phone in Leblanc to begin confidant events. However, be aware that Joker will need at least Level 3 Guts "Staunch" in order to call her.