
The song Onegai Muscle is the opening theme song of the anime Dumbbell Nan-Kilo Moteru?. The song is performed by Ai Fairouz and Kaito Ishikawa. Fairouz, who is also the voice actress of the anime's main character, stars in the music video for the song alongside professional wrestler Reika Saiki and bodybuilder Naotaka Yokokawa.
| Characteristics | Values |
|---|---|
| Singer | Ai Fairouz |
| Co-singer | Kaito Ishikawa |
| Anime | Dumbbell Nan Kilo Moteru? |
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What You'll Learn

Ai Fairuz sings 'Onegai Muscle'
Ai Fairuz, a Japanese voice actress, sang the song "Onegai Muscle" (お願いマッスル) for the anime series "How Heavy Are the Dumbbells You Lift?" (Danberu Nan-Kiro Moteru?). The song serves as the opening theme for the series, and Ai Fairuz performed it alongside Kaito Ishikawa.
Ai Fairuz was born on July 6, 1993, in Tokyo, Japan, to a Japanese mother and an Egyptian father. She spent part of her elementary education at Cairo Japanese School before returning to Japan. During her junior high school years, she developed an interest in the manga series "JoJo's Bizarre Adventure" and participated in Skype reading sessions with other fans. This passion led her to pursue a career in voice acting, and she eventually enrolled in a voice-acting training school.
In 2019, Ai Fairuz landed her first significant role as Hibiki Sakura, the protagonist of "How Heavy Are the Dumbbells You Lift?". She also played notable characters in other anime series, such as Manatsu Natsuumi/Cure Summer in "Tropical-Rouge! Pretty Cure" and Jolyne Cujoh in the anime adaptation of "JoJo's Bizarre Adventure: Stone Ocean."
The song "Onegai Muscle" has become popular among fans of the anime and has been featured on platforms like Reddit, where users have shared lyrics and discussed the song. The song's upbeat and energetic tone reflects the theme of weightlifting and fitness present in the anime series.
Ai Fairuz's performance in "Onegai Muscle" showcases her talent as a voice actress and singer. Her involvement in the opening theme of "How Heavy Are the Dumbbells You Lift?" further highlights her versatility and contribution to the anime industry.
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It is the opening theme song of the anime 'Dumbbell Nan Kilo Moteru'
"Onegai Muscle" is the opening theme song of the anime "Dumbbell Nan Kilo Moteru." The song is performed by Hibiki Sakura (Fairouz Ai) and Naruzou Machio (Kaito Ishikawa). The lyrics to "Onegai Muscle" are written in Japanese, with some English words and phrases. The song is upbeat and motivational, reflecting the anime's theme of weight training and self-improvement.
The lyrics of "Onegai Muscle" are filled with references to fitness and working out. Phrases like "Hip raise!" "Side bend!" "Dumbbell curl!" and "Push up!" are interwoven with motivational lines such as "Risou no jibun wo omoi egaitara," encouraging listeners to start their training journey. The song also acknowledges the challenges of fitness, with lines like "Yabame no genjitsu nantoka naruhazu," which recognises the reality of facing difficulties.
The chorus, "Onegai muscle meccha motetaaaai," is a playful and catchy hook that is repeated throughout the song. The word "Onegai" means "please" or "I request," and when combined with muscle, it creates a fun and lighthearted appeal for muscular strength. The song's energy and enthusiasm are enhanced by exclamations like "YES!" "NICE!" and "HAI!"
"Onegai Muscle" has become a popular song among anime fans and fitness enthusiasts alike. Its combination of energetic music, creative lyrics, and enthusiastic performance by the singers make it a memorable and enjoyable opening theme for "Dumbbell Nan Kilo Moteru."
Overall, "Onegai Muscle" effectively captures the spirit of the anime, inspiring listeners to embrace a healthier lifestyle and have fun while doing so. The song's impact extends beyond its role as an opening theme, becoming a motivational anthem for anyone striving to improve their physical fitness and muscle power.
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The song is about getting fit and exercising
The song "Onegai Muscle" is performed by Hibiki Sakura (CV: Ai Fairuz) and Naruzou Machio (CV: Kaito Ishikawa). It is the opening theme song of the anime "Dumbbell Nan Kilo Moteru?". The lyrics of the song are centred around exercising and working out, with references to specific exercises such as leg curls, hack lifts, back presses, and side raises. The song also mentions the importance of diet in building muscle, with the line "Kedo taberu no taisetsu, kin niku no hiketsu/ Shokuji de karada wo kensetsu!" which translates to "Meals are important, the secret to muscle/ Build your body with meals!".
The anime "Dumbbell Nan Kilo Moteru?" follows a girl's journey to get fit for summer despite having no knowledge of how to exercise properly. This theme is reflected in the song "Onegai Muscle", which encourages listeners to start their training immediately and not give up despite the challenges of working out. The song promotes a positive body image and the benefits of exercise, with lyrics that translate to "If you imagine your ideal self, start training now/ No matter how harsh the reality, somehow/ Dumbbell in both hands, free-weight".
The song and its accompanying music video also showcase professional wrestlers and bodybuilders, further emphasizing the theme of fitness and exercise. The video stars muscle idol Reika Saiki and bodybuilder Naotaka Yokokawa working out together. "Onegai Muscle" also has an upbeat and energetic tone, which is common in anime opening theme songs.
Overall, "Onegai Muscle" is a fun and motivational song that encourages listeners to embrace exercise and fitness, with specific references to weight training and the importance of diet. It reflects the anime's theme of a girl trying to get fit and promotes a positive attitude towards working out and achieving one's ideal self.
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The music video features wrestler Reika Saiki and bodybuilder Naotaka Yokokawa
The "Onegai Muscle" song is the opening theme to the anime "How Heavy Are the Dumbbells You Lift?" or "Dumbbell Nan Kilo Moteru?". The song has an infectiously upbeat tempo and is easy to sing along to, with its catchy lyrics featuring the phrase "Onegai muscle!" repeated throughout.
The music video for "Onegai Muscle" features wrestler Reika Saiki and bodybuilder Naotaka Yokokawa. The video has garnered over 115 million views, far surpassing the expectations of its creators. The song and anime series have inspired many people to start working out, incorporating the theme song into their exercise routines. The cheerful and encouraging dynamic between Saiki and Yokokawa in the video further adds to its popularity.
Reika Saiki, also known as Japan's muscle idol, expressed surprise at the song's massive success. She shared that she initially expected the video to receive only around 10,000 views. Naotaka Yokokawa added that the song's final message, "You're beautiful when you do your best," resonates positively with its audience.
The presence of real-life bodybuilders like Saiki and Yokokawa in the music video enhances the appeal of the anime series, creating a unique blend of fiction and reality. The song's uplifting message, combined with the energetic performance of Saiki and Yokokawa, has likely contributed to its widespread popularity within the otaku community and beyond.
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Lyrics are available in both Japanese and English
The song "Onegai Muscle" from the anime "Dumbbell Nan Kilo Moteru?" has lyrics available in both Japanese and English. The Japanese lyrics are written in kanji and hiragana, while the English lyrics are written in the Latin alphabet.
The Japanese lyrics include phrases such as "Onegai muscle meccha motetaaaai" and "Kin niku ni onegai," while the English lyrics include phrases such as "Gotta get muscle" and "Please give me muscles." Both versions of the lyrics convey a similar message of wanting to build muscle and shape the body.
The English lyrics were written by Tara St. Michel and are a translation of the original Japanese lyrics. Some variations exist between different sources of English lyrics, with certain phrases being interpreted differently or adapted to fit the rhythm and rhyme scheme of the song.
The song is performed by Hibiki Sakura (CV: Ai Fairuz) and Naruzou Machio (CV: Kaito Ishikawa). It serves as the opening theme for the anime "Dumbbell Nan Kilo Moteru?" and has gained popularity among fans of the series and beyond.
Overall, the availability of both Japanese and English lyrics allows a wider audience to enjoy and understand the song, showcasing the appeal of anime music across different languages.
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Frequently asked questions
"Onegai Muscle" is sung by Ai Fairouz and Kaito Ishikawa.
"Onegai Muscle" is about a girl's quest to get fit for summer with no knowledge of how to exercise properly.
"Onegai Muscle" is the opening theme song for the anime "Dumbbell Nan Kilo Moteru?".
The music video for "Onegai Muscle" stars professional wrestler Reika Saiki and bodybuilder Naotaka Yokokawa.
The ending theme song is titled "Macho Anemu?" and is performed by Kaito Ishikawa.





























