Back Number’s Mutual Love Songs: Popular Song Ranking [2026]

Ritz partyback number8rank/position

Ritz Party / back number (cover)

This song by back number seems to express the bond with a loved one that remains unchanged even when you’re apart.

The sound, which conveys both strength and tenderness, is striking and evokes the feeling of sharing heartfelt thoughts with someone important.

The lyrics depict both people feeling sorry that they have less time together now, yet affirming that their love hasn’t changed.

Even as they trust each other, the development that makes them realize the importance of talking directly at times also conveys the warm feelings shared between the two.

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kappamaki

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Important thingsback number9rank/position

Daijinakoto

A warm ballad that gently depicts the misunderstandings, conflicts, and the importance of trust between lovers.

The relationship—born of strong feelings for the other person—that can bring about anxiety, hesitation, and sometimes arguments is portrayed from a down-to-earth perspective.

Released as a coupling track to the single “Hanataba” in June 2011, it was also chosen as the ending theme for NHK’s documentary program “Mirai e no Tobira.” With its calm melody line, this song is considered relatively easy to sing among back number’s tracks.

Because it invites heartfelt singing even at karaoke, it’s a perfect choice when you want to think of your partner or someone dear to you and convey your honest feelings.

Happinessback number10rank/position

Happiness / back number (cover)

The protagonist is a girl who has an unrequited crush on a man, but he likes someone else…

Even so, it’s a masterpiece that conveys her straightforward feelings of “I only wish for your happiness.” Because she’s always by his side, she sees things she doesn’t want to see and it hurts, yet she wants to stay close because she loves him…

It’s a truly heartrending love song.

Heroineback number11rank/position

back number “Heroine” Music Video

A song that gently embraces the hearts of those carrying a bittersweet longing.

Released in January 2015, it was featured in JR East’s “JR SKISKI” campaign and Kirin’s “Tanrei Green Label” commercials.

Set against a backdrop of beautifully falling snow, it sings of pure feelings for a loved one.

The lyrics, which liken the person in love to a “heroine,” are sure to resonate with listeners.

Why not listen to it with someone special during a winter date or while gazing at a snowy landscape?

cotton candyback number12rank/position

back number – Watagashi (full)

A heartwarming love song that gently embraces the bittersweet feelings of a summer festival.

It delicately portrays the fluttering excitement in your chest, the frustration of wanting to hold hands but not being able to take that step, and the emotions stirred by the other person’s casual gestures, all set to a calm melody.

Released in July 2012, it was chosen as the opening theme for TBS’s “COUNT DOWN TV,” capturing the hearts of many.

The song resonates with listeners’ own summer memories, making it perfect for karaoke, where you can fully immerse yourself in its world.

With a softly accompanying melody and few sudden pitch changes, it’s an easy, enjoyable choice for karaoke.

Winter and Springback number13rank/position

back number – Winter and Spring

Released by back number in January 2024, this piece portrays the feelings of a heartbroken woman by overlaying them with scenes of snowmelt.

The music video features a standout performance by actress Anna Ishii, and the visual beauty—directed by Iyori Shimizu—also drew attention.

With a melody that evokes both the end of love and a new beginning, this work resonates deeply and is recommended for those trying to overcome the pain of heartbreak or seeking to rediscover their own worth.

It’s a song you’ll want to listen to alone on a quiet winter night.

Until the day I can no longer rememberback number14rank/position

back number – Until the Day It Becomes Unrememberable (Short ver.)

For those who can’t stop thinking about an ex, the song you should listen to is “Omoidasenakunaru Sono Hi Made” (“Until the Day I Can No Longer Remember”).

It was released in 2011 by the rock band back number, known for their many love songs.

The track features a passionate band performance enriched with strings.

Many listeners will relate to the lyrics overflowing with feelings for a lover from whom they’ve grown apart.

It’s a unrequited-love song that portrays the ache in a heart that once shared both joy and sorrow as a pair.

Give this sentimental ballad about a wintertime parting a listen.

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mutō

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