Hirotaka Wakamatsu is a supporting character in the anime and manga series Monthly Girls' Nozaki-kun. He's good friends with Chiyo Sakura and Umetarou Nozaki, the latter of which employed Hirotaka as a manga assistant, as the guy who erases. He claims to hate Yuzuki Seo, due to her constantly terrorizing the basketball team, which caused his insomnia, which is ironic because he is oblivious that Lorelei of the Choir Club is the alternate persona of Seo, who has a beautiful singing voice that is able to sooth him and allow him to go to sleep.
He is voiced by Ryōhei Kimura in the Japanese version of the anime, and Cameron Bautsch in the English version of the anime.
Hirotaka Wakamatsu is a tall teenage boy, with pale skin, brown hair, green eyes, and a white t-shirt covered with a green jacket, gray pants, and brown shoes on his feet.
Wakamatsu is easygoing, but he can be naïve and has a tendency to take things at face value. For example, in an attempt to stand up to Yuzuki Seo, he consults Umetarou Nozaki and his collection of shoujo manga on how to do so. This leads to him sending Seo a love letter, rather than a letter of challenge. He also compares her to his "Goddess," the Lorelei of the Glee Club (who is Seo herself), in order to try to put her down.
He's very sensitive and gets emotionally hurt very easily. When things don't work out for him, he never seems to understand why or what went wrong.
His combination of sensitivity, energy and naivety can make him do extreme or unexpected things. His friends do not trust him with a knife because they are scared he might kill someone.
- Wakamatsu birthday is on World Sleep Day.
- Wakamatsu's family is a father, mother, elder sister and younger brother (who is in elementary school).
- In assisting Umetarou Nozaki, Wakamatsu is in charge of screen tones and erasing.
- Wakamatsu's hobby is playing basketball and spending his holidays playing with friends.
- Wakamatsu is good at doing simple tasks and moving his body. He is not good with work that needs creativity and applied skills.
- Wakamatsu's clothing choice is prince-like clothing, with a sober and clean feeling (the ones using fabric material)
- Wakamatsu is good in P.E. and English class. His worst subject is Modern Literature. His elective subject is Calligraphy.
- Wakamatsu likes to eat curry hamburgers and does not like shiitake.
- Wakamatsu's type of girl are girls with cute personalities who are smaller than him.
- Wakamatsu did not originally recognize Yuu Kashima as being female.
- Nozaki uses him as reference for a female secondary character, Waka, in his manga.
- Wakamatsu is ranked 7th in the character popularity poll, last place among the main cast.
- Wakamatsu attended the same middle school as Mayu Nozaki and Umetarou Nozaki.
- Wakamatsu plays basketball and shares the same voice actor with Ryota Kise from Kuroko No Basuke, Ryohei Kimura. And also coincidentally, they both share the same jersey number, No. 7.