|Name: Tarou Mitsuki (海月 太郎 Mitsuki Tarō)|
|Hair Color: Dark Brown|
|Eye Color: Dark Red|
|Talent: Piano Playing|
|Favorite Subject: Music|
|Favorite Color: Brownish Red|
|Favorite Type of Girls: Low Maintenance Girls|
|Hopes to Go: Germany|
|Enemies: Gaito, Sara (former)|
|Love Interests: Sara and Hanon Hôshô|
|Voice Actor: Daisuke Kishio|
|Position in the Series: Supporting Character|
Tarou Mitsuki (海月 太郎 Mitsuki Tarō) was Lucia, Hanon, and Rina's music teacher at school. Since he is rather young, he easily got along with Hanon and the other students. Hanon sometimes calls him "Tarou-chan" or "Mitsuki-sensei".
He was the music teacher at Lucia, Hanon, and Rina's school. He once had a relationship with Sara years ago but he left. Later on Tarou revealed why he left Sara, because she was the orange pearl princess and had a lot of responsibilities. After he wrote a love letter to Hanon Hosho.
Tarou is a kind-hearted man who deeply cares for his music. While he looks happy and pleasant on the outside, he has a deep secret involving his knowledge about mermaids. The memories of his relationship with Sara always come to his head whenever he is playing the piano, though depending on how he is feeling, he can make the song very relaxing or sad sounding. Tarou probably thinks about Sara all the time, since the piano song he wrote was originally dedicated to Sara.
Despite his feelings for Sara, there is a possibilty that Tarou may had also had feelings for Hanon as well. Proof would be whenever Hanon links her arm around his arm, he never seems to be bothered by this action, and he also blushed in front of Hanon in episode 22. Another obvious proof was before his departure to Germany, he spent the whole night before writing a piano piece and kissed Hanon's forehead before leaving.
Tarou has dark brown hair and usually wears a beige suit and tie. In his memories with Sara, he wore a light green t-shirt and blue jeans. During his piano recitals, he wears a black tux and somewhere hidden in his jacket pocket, he'd have his half of the oyster shell which symbolizes his relationship/love with Sara.