Hatsune is Kazuki's big sister, who is constantly trying to get Kazuki and Yuuji together and inadvertently puts them both into embarrassing and lascivious situations. There are some indications that she considers the mishaps (and the arguments following them) funny. She is extremely popular at school with many clubs wanting her to become a member. Hatsune is good at everything she does, from cooking to sports, and is extremely well-endowed. She likes to tease her sister by showing her how infatuated Yuuji is with her breasts. Hatsune frequently engages in cosplay around the house and can, from time to time, be quite frightening to the people around her. Unlike her younger sister and Marie, Hatsune is perfectly unafraid of insects - or anything else. Although it's implied that Hatsune's true weakness is worrying about her sister's health. When Kazuki fell ill with a cold, Hatsune became comically uncoordinated and unskillful in cooking. She occasionally (and sarcastically) appears to have an attraction to her younger sister.     - Wikipedia

Kazuki has been awaiting 10 years for the day when her neighbours moved back to their old house. She has a crush on Yuuji, whom she considers as her first love but to whom she never managed to express her feelings for him before they moved out. Yuuji often comes over to play with Kazuki, Kazuki's older sister Hatsune and Yuuji's sister Marie when they were kids. Her ideal depiction of Yuuji was soon shattered when he turned out more than she had expected, him acting all ecchi during their reunion. With their parents off in South America, both families must learn to live with each other and rekindle the childhood feelings they shared together. Things get even more crazy as they attend the same school.
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(Source: Anime News Network)

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Her younger brother [Takashi Oohara](https://anilist.co/staff/96636/) is also a voice actor.

__Non-anime roles:__
- Harran - Goddess of Victory - Nikke (VG)
- Ningguang - Genshin Impact (VG)
- Mikasa - Azur Lane (VG)

The Arisaka sisters (Hatsune and Kazuki) and the Kagura siblings (Yuuji and Marie) lived next door when they were smaller. So close that they could climb onto each other's verandas from the 2nd floor. They would always play together until one day the Kagura siblings had to move.<br><br>
It's been 10 years and the Kagura siblings are moving back! Yuuji's turned into a pervert and Marie isn't the crybaby she used to be?!

Hatsune Arisaka