How to Sing Like Kusano (Spitz): Vocal Range, Breathy Mix & the Technique Behind It

What makes Kusano Masamune's vocals in Spitz demanding isn't a sky-high ceiling — it's an unusually high floor: most of his songs sit continuously in the male passaggio zone rather than reaching for one big note, so the real challenge is sustaining an effortless, breathy mix through an entire chorus, not hitting a single peak.

Safety note: None of the techniques here should cause throat tightness, a pressed sensation, or hoarseness lasting more than 24 hours. Passaggio endurance should come from breath support and a low-pressure mix, never from squeezing the throat to hold a note steady. If a phrase starts to feel effortful instead of controlled, drop the key or shorten the phrase. Consult an ENT specialist for hoarseness lasting more than two weeks.

Kusano's Vocal Profile

There is no official aggregate vocal range figure for Kusano Masamune, and no verified voice-classification thread exists for him. What multiple Japanese vocal coaching sources converge on instead is a description of how he sings: light, high-sitting, breathy mixed-voice dominant, with a tone often described as clear yet smoky, built on an effortless technique (脱力, datsuryoku) and a front-lower resonance placement rather than a bright, forward mask placement.

If your first exposure to his voice is more recent than the back catalog, a likely entry point is 『美しい鰭』 (Utsukushii Hire), the theme song for the 2023 Detective Conan movie — useful context, though the breakdown below focuses on catalog staples with verified song-level range data.

Song-by-song figures, drawn from melodic transcriptions that separate chest voice from falsetto, give a clearer picture than any single range number:

• Chest voice across his catalog runs roughly C3 to C5, with falsetto reaching up to D5.
• Individual tracks vary widely in tessitura even when the peak note is similar — see the song table below.

Song-Level Range vs. Physiological Range

The figures above come from song-by-song melodic transcription, not from any test of Kusano's physiological ceiling — no public measurement of his maximum range exists. One Japanese vocal-range site was explicit about this gap: it could not find a recorded chest-voice passage exceeding C5 and judged his physiological ceiling "undeterminable." Treat the song-level figures below as "what this track requires," not a claim about his personal limits — one describes a melody, the other a singer's body, and the two shouldn't mix.

Kusano's Signature Songs — by Vocal Challenge

Working through his catalog by tessitura, rather than by popularity, gives you a natural training order. Every song here is a lead vocal part with almost no competing backing melody, so the ranges below map cleanly onto a single voice.

The D5 falsetto in "涙がキラリ☆" — along with similar moments in "ハネモノ" and "漣" — is tagged in the source transcription as an ad-lib or fake-vocal flourish rather than a fixed melody note. Treat it as an advanced improvisation target, not something to memorize as "the melody." "今" and "僕はきっと旅に出る" are the destination, not the starting line: a single chest C5 with no run-up demands every skill on this list already working together.

The 3 Techniques Behind Kusano's Sound

Effortless Full-Range Mix (脱力ミックス)

Kusano's mix relies on low breath pressure and low vocal fold compression, which lets the tone shift along a front-lower resonance axis as pitch rises instead of adding chest weight. That's why a phrase in "Robinson" doesn't sound noticeably different in color at F#3 versus at B4. The common mistake is adding chest weight to push through the passaggio, which thickens the tone and often produces a pressed or cracking sound right where the melody needs to stay smooth. In Bloom Vocal, mixed voice resonance blending and breath-supported mix stability exercises train this coordination. The mix voice practice guide covers the register-blending fundamentals this technique is built on.

Breathy, Non-Engaged Tone

Instead of engaging the false vocal folds, Kusano lets extra air flow through the glottis, producing a translucent tone that holds up near the top of his range instead of thinning into strain. The common mistake is confusing "breathy" with "quieter" — dropping volume without maintaining breath support makes pitch unstable, while a properly supported breathy tone stays centered on pitch. Semi-occluded vocal tract exercises and controlled airflow drills train this distinction directly. The SOVT breathy voice correction guide walks through the airflow control this tone depends on, and Bloom's SOVT straw phonation and breath flow control exercises reinforce it in daily practice.

Fall and Shakuri Phrase Shaping

At the end of a phrase, Kusano frequently lets pitch and breath decay together rather than cutting the note off sharply — an ornament close to what Japanese vocal coaching calls shakuri or a vocal fall. The effect is that objectively high pitches read as soft and unforced rather than strained, even in a tessitura that sits above typical untrained male range. The common mistake is holding a note at full pitch and volume right up to a hard cutoff, which reads as tense even when the pitch itself was accurate. Practicing a controlled decay in both pitch and breath at phrase endings builds this shaping deliberately rather than leaving it to chance.

If there's one single exercise that addresses Kusano's defining challenge — a tessitura that stays high for an entire song rather than peaking on one note — it's controlled belt-load management, which trains vocal fold closure and breath pressure to hold steady across sustained time in the passaggio, not just at a single pitch.

How to Train Toward Kusano's Style

Step 1 — Map your passaggio zone, not just your ceiling

Run a range test and identify where your passaggio zone sits, then pick a Spitz song key where that zone lines up with your comfortable mix. Since most of his songs stay in this zone for an entire chorus, the zone matters more than your absolute top note.

Step 2 — Train a low breath-pressure mix across the zone

Sustain tones moving through your passaggio zone at low, even breath pressure, checking that you aren't adding chest weight as pitch climbs. This is the effortless mix that keeps tone color consistent from a song's lowest notes to its highest.

Step 3 — Build a breathy tone that holds without cracking

Sustain a note while deliberately letting extra air pass through the glottis, watching that pitch stays centered rather than wavering. The target is a translucent tone that's still fully supported, not a note sung quietly with no support underneath it.

Step 4 — Practice fall and shakuri phrase endings

Take a phrase ending on a sustained note and let both pitch and breath decay together instead of stopping abruptly. Compare this against a hard cutoff on the same phrase to hear how much tension the fall removes.

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

Choose one 4-to-8 bar phrase that spans your passaggio zone — the "Robinson" chorus is a good test case — record it, and use Bloom Vocal's AI coaching to score your pitch accuracy, breath support, and register transitions. The AI surfaces a mix that's quietly losing breath support well before it would be audible to your own ear.

Check Your Cover with AI

Ear-based imitation has a ceiling here: a mix voice that's slowly losing support doesn't sound obviously "wrong" the way a cracked note does, so it's easy to practice the wrong habit for weeks without noticing. Record a passage from Kusano's repertoire — the sustained passaggio stretch in "Robinson" or the single unprepared C5 in "今" — and Bloom Vocal's AI scores your pitch accuracy, breath support, register transitions, rhythm, and expression on a 1–5 rubric, then recommends the exercises to address your weakest area first. It turns a vague "that felt off" into something concrete, like "your mix lost breath support climbing from F#3 to B4 — drill mixed voice resonance blending and breath-supported mix stability before attempting the chorus at full tempo."

For more on how to sing like other Japanese vocalists, see Aimyon, Fujii Kaze, Motoki (Mrs. GREEN APPLE), and Yuuri.

---

References

• Sadolin, C. (2000). Complete Vocal Technique. Shout Publishing. [Vocal mode classifications, including breathy and neutral vocal modes relevant to an effortless, low-compression mixed voice.]
• Titze, I. R., & Verdolini Abbott, K. (2012). Vocology: The Science and Practice of Voice Habilitation. National Center for Voice and Speech. [Breath support and subglottal pressure management underlying sustained phonation across the passaggio.]