How to Sing Like Hiro of MY FIRST STORY: Vocal Range, Edge Voice & the Technique Behind It

Singing like Hiro (Hiroki Moriuchi) of MY FIRST STORY has less to do with a freakishly high natural voice and more to do with two trainable skills: a passaggio-safe mix voice that reaches into the C#5–D5 range without strain, and a controlled edge-voice texture layered on top of clean pitch rather than forced through a squeezed throat. His catalog — anchored by the Demon Slayer: Hashira Training Arc opening "夢幻 / Mugen" — sounds ferociously high because of technique and texture, not because his voice ignores the normal rules of range.

Safety note: Edge voice (vocal fry layered on a sustained pitch) should feel light and controlled, never like pressing or grinding the throat to force a rough sound. Pushing the larynx down to manufacture rasp will pull pitch flat and tire the voice fast. If a phrase starts to feel forced, or your voice stays rough for more than a day afterward, drop the key or scale back. See an ENT specialist for hoarseness that lasts beyond two weeks.

Hiro (Hiroki Moriuchi)'s Vocal Profile

MY FIRST STORY has no institutionally confirmed vocal range for Hiro, so every figure below is drawn from independent fan-analysis catalogs rather than lab measurement — treat it as approximate.

Catalog-wide figures put his chest-voice floor around F#2 and his absolute catalog ceiling near F5 (falsetto, on "ACCIDENT"). His working chest-voice range for sustained singing sits closer to B2–E5, and most of his best-known choruses top out around C#5–D5 rather than at the extreme ceiling — the two independent fan-analysis sources that report this both point to the same band, which is a reasonable amount of agreement for unofficial data. Figures above E5 in his catalog tend to come from fake/scream passages rather than sustained full-voice singing, so a single "highest note" claim isn't a reliable way to describe his range.

He's commonly described as a high, raspy rock tenor — this is an informal descriptor used by fans and vocal coaches, not a classification from a vocal institution, and it points to the combination of a high chest-voice ceiling with an edge-voice texture rather than to any single measured trait.

Hiro's Signature Songs — by Vocal Challenge

Working through these by technical demand gives a natural training order. Transpose any of them to a key that fits your voice.

"夢幻 / Mugen" is a genuine outlier on this list — because it's a co-credited duet with HYDE, its extremes shouldn't be read as a solo benchmark for Hiro's range. It's a useful listening reference for the song's chromatic movement, not a target note to isolate and attribute to one voice.

The 3 Techniques Behind Hiro's Sound

Edge Voice as Texture

Hiro layers a vocal-fry-based scratch on top of a sustained note, which adds aggression to the tone while the vocal folds keep clean, regular contact underneath — pitch stays intact even though the surface sound is rough. The common mistake is pressing the larynx down to force a gritty sound directly, which pulls pitch flat and fatigues the voice within a few songs. In Bloom Vocal, vocal fry / edge voice drills (C-15) and onset control exercises (C-16) build this texture safely. The vocal fry onset guide covers the same controlled-scratch technique from the ground up.

Chest-to-Falsetto Flip

Mid-phrase, Hiro snaps into a bright falsetto and back to chest voice almost instantly. The flip reads as intentional rather than accidental because the resonance color on both sides of the break is matched in advance. The common mistake is letting an unplanned crack happen at an unpredictable spot in the phrase, which sounds like a mistake instead of a stylistic choice. In Bloom Vocal, head-voice resonance exploration (E-7), siren slide drills (C-1), and chest-to-mix transition training (C-4) build the coordination this flip requires. The male passaggio and mix voice drill works the same transition zone in more depth.

High-Note Endurance, Not Just the Peak

Songs like "最終回STORY" repeat a high note like C#5 ten or more times rather than asking for one dramatic peak. What's actually being trained is the ability to hold that register for three minutes, not the ability to touch it once. The common mistake is spending everything on the first chorus and running out of support by the final key change. In Bloom Vocal, belt load management (C-10), vocal fold endurance conditioning (A-8), and vocal cooldown routines (H-1) build this stamina. The singing high notes without strain guide applies the same load-management principle to sustained high singing generally.

How to Train Toward Hiro's Style

Step 1 — Confirm your passaggio-safe mix voice

Work a mid-high phrase similar to "Home" (roughly G#3–C#5, transposed to a comfortable key) and check that the vowel is narrowing into mix voice rather than being pushed up in raw chest voice.

Step 2 — Add edge voice as texture, not force

Hold a comfortable sustained note and layer a light vocal-fry scratch on top, keeping the larynx relaxed rather than pressing down to manufacture the rasp.

Step 3 — Drill the chest-to-falsetto flip

Practice snapping from chest voice into a bright falsetto and back within a single phrase, matching resonance color on both sides so the transition sounds deliberate.

Step 4 — Train high-note endurance, not just the peak

Repeat a phrase near your comfortable ceiling five or six times in a row. Focus on maintaining support through the final repetition rather than maximizing the first one.

Step 5 — Run an AI feedback loop on a single phrase

Record a short phrase that crosses your passaggio and repeats near the top of your range, then use Bloom Vocal's AI coaching to score pitch accuracy, breath support, and register blending across the repeats.

Check Your Cover with AI

It's hard to hear your own edge voice sliding into throat pressure, or your support thinning on the fifth repetition of a high phrase, while you're the one singing it. Record a phrase from Hiro's repertoire — a passaggio line from "Home" or a repeated high chorus modeled on "最終回STORY" — and Bloom Vocal's AI scores your pitch accuracy, breath support, register transitions, rhythm, and expression on a 1–5 rubric, then recommends the specific exercise to work on first. It turns a vague "that got rough by the last repeat" into "your support dropped going into the fourth C#5 — work belt load management before adding the scratch texture back in."

For more on how to sing like other J-rock vocalists, see Gotoh of Asian Kung-Fu Generation, Noda of RADWIMPS, TK of Ling tosite sigure, and Ozaki of Creephyp.

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References

• Sadolin, C. (2000). Complete Vocal Technique. Shout Publishing. [Edge voice, distortion, and vocal-fry mechanics, including how controlled fold contact underlies a rough surface texture without pitch loss.]
• Titze, I. R., & Verdolini Abbott, K. (2012). Vocology: The Science and Practice of Voice Habilitation. National Center for Voice and Speech. [Vocal fold load management and fatigue underlying repeated high-note phrases and endurance training.]