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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Heroineback number9rank/position

back number “Heroine” Music Video

This song is one of back number’s most beloved winter love songs among fans.

In particular, the chorus lyrics capture both the beauty of the scene and his feelings for her, making it a track that fills you with warmth.

You can really picture them having fun together in the snow.

It has a fresh vibe that makes you want to listen to it in a place where beautiful winter snow piles up, and it’s reputed to make your heart flutter if it comes on during a date.

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.

Until the day I can no longer rememberback number11rank/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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Important thingsback number12rank/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.

cotton candyback number13rank/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.

Happy Endingback number14rank/position

back number – Happy End (full)

This song was chosen as the theme for the film “My Tomorrow, Your Yesterday,” which portrays a heartrending love story.

Its poignant, heart‑tightening lyrics and beautiful melody leave a strong impression.

Released in November 2016 as back number’s 16th single, it was written and composed by Iyori Shimizu.

The music video features Tori Matsuzaka and Haruna Kawaguchi, and its delicate depiction of the pain of long-distance relationships and the struggle of parting drew significant attention.

If you’ve experienced a breakup or are troubled about a relationship with someone important, this is a song that will speak to your heart—please give it a listen.