[Setsuna-kei] Incredibly tear-jerking! Classic heartbreaking J-pop songs

Until the day I can no longer rememberback number

back number – Until the Day It Becomes Unrememberable (full)

A poignant ballad by back number that quietly sings of lingering feelings and a sense of loss for a former lover.

Released in October 2011 as their third single, the song is also included on the album “Superstar,” which came out the same month.

The lyrics portray the emptiness of days that keep going even after losing the most important person in the world, and the deep bond in which the two formed halves of each other.

Fear of memories of the other fading intertwines with the resignation that they will eventually be forgotten, and the realization that the time spent with the person was part of oneself wells up with aching tenderness.

A song that offers comfort to anyone who has lost someone dear.

366 daysHY

HY – 366 Days (Official Music Video)

This is a ballad that delicately portrays the bittersweet feeling of a love once deeply cherished that never fades from the heart, even as time passes.

The protagonist, unable to stop thinking about the person they parted with all day long, is gently and vividly depicted through Izumi Nakasone’s powerful yet tender vocals.

Included on the 2008 album “HeartY,” it was also used as the theme song for the film “Thread of Red (Akai Ito).” There’s also a well-known anecdote that the songwriter temporarily broke up with their partner at the time in order to write the lyrics.

It’s a song that quietly sits beside those whose heartbreak hasn’t healed, or on nights when you find yourself reminiscing about a past love.

MetronomeYonezu Kenshi

Kenshi Yonezu – Metronome

A song that overlays the gradual misalignment of two people’s relationship with an instrument keeping a steady rhythm, conveying a poignant sense of missed connections that tugs at the heart.

Included on the 2015 album “Bremen,” this track powerfully conveys the helplessness of starting in the same tempo only to drift apart over time, as well as the lingering attachment that makes you keep searching for the other person even after you’ve parted.

The animated music video—hand-drawn by Kenshi Yonezu himself with about 200 illustrations—visually deepens the song’s world and leaves a strong impression.

For anyone with an unforgettable love or who has experienced growing apart from someone dear, this is a sorrowful yet beautiful ballad that resonates deeply.

Maplesupittsu

Spitz / Kaede

It’s one of Spitz’s signature ballads and an absolutely indispensable song when introducing bittersweet tracks.

The song was originally included on the March 1998 album “Fake Fur,” and was later released as a single.

It has been used as an insert song across eras, in dramas like “Over Time” and “silent,” so I think many people have heard it.

The lyrics convey a heartfelt resolve to keep moving forward while holding tight to memories of a beloved person one can no longer meet, and it really squeezes your heart.

Masamune Kusano’s soft, clear vocals and the band’s warm performance seem to gently permeate a sorrowful heart, while at the same time accentuating the loneliness embedded in the lyrics.

HeavenMrs. GREEN APPLE

Mrs. GREEN APPLE “Heaven” Official Music Video

Released in May 2025 as the theme song for the film “I Will Tell You the Truth,” this track makes a striking impression with its structure: it shifts from a quietly sacred opening to an unpredictable development.

The lyrics gaze equally at the light and shadow, the beauty and ugliness inherent in humanity, hinting at a new depth in Mrs.

GREEN APPLE’s expression.

The unusual promotion—available only within the film—also became a major topic on social media.

Different from their usual brightness, the layered, heart-wrenching melody is sure to resonate deeply with you.

evening primroseNovelbright

Novelbright – Evening Primrose [Official Music Video]

This work portrays a poignant state of mind: unable to forget a once‑beloved person, the protagonist can’t help but keep chasing their lingering shadow as memories of days gone by well up.

Vocalist Yudai Takenaka’s delicate high-tone voice gently envelops the pain of a protagonist who cannot accept the breakup.

The grand sound centered on piano and strings is another highlight.

It’s a song to listen to when you want something to stay close to the pain of heartbreak, or when you can’t take a step into a new love.

I miss youRADWIMPS

RADWIMPS – Aitai

Released in March 2021, this song expresses the feelings held at the 10-year milestone since the Great East Japan Earthquake.

Placed at the end of the album “2+0+2+1+3+1+1 = 10 years 10 songs,” it conveys a pure longing to see someone—an emotion only RADWIMPS, who have continued singing for a decade, could capture.

It is a ballad whose quiet, emotive melody seeps into the heart, carrying thoughts for loved ones we can no longer meet.

Beyond being a prayer for those lost in the disaster, it also resonates with the sense of distance and loss during the COVID-19 pandemic, giving voice to the universal ache of “not being able to see someone.” It’s a song that gently stays by your side when you feel the loneliness of being apart from someone dear.