Ryusei Sakuma and OZworld Deliver Heartfelt Okinawa Tribute With New Song ‘Those Days’

Ryusei Sakuma and OZworld are turning childhood memories into music with the release of “Those Days -童神～天の子守唄～- feat. OZworld,” a deeply personal collaboration that pays tribute to their shared hometown of Kadena, Okinawa. Rather than relying on a familiar vintage record, the pair drew inspiration from something far more meaningful—an elementary school anthem they once sang together—creating a song that blends nostalgia, friendship, and cultural heritage into one heartfelt release.

The new track marks one of Ryusei Sakuma’s most intimate projects to date, pairing his soulful R&B vocals with OZworld’s introspective rap verses. Rich with references to their upbringing, “Those Days” celebrates the experiences that shaped both artists while highlighting the enduring influence of Okinawa on their music.

Ryusei Sakuma and OZworld Turn Hometown Memories Into “Those Days”

At the heart of “Those Days” is Kadena, the Okinawan town where Ryusei Sakuma and OZworld spent their childhoods.

The lyrics weave together personal memories that only the two artists could share, referencing familiar local landmarks, Ryusei Sakuma’s transfer to another school during his youth and even a phrase borrowed from the elementary school anthem they once performed together. While many artists sample classic recordings, Ryusei Sakuma and OZworld instead chose to incorporate a piece of their own childhood, making the song an authentic reflection of their shared past.

Despite its nostalgic foundation, “Those Days” is about more than revisiting old memories. The song conveys a commitment to staying true to the dreams that first inspired both artists while expressing hope that they can eventually return to Okinawa after building successful careers beyond their hometown.

Rather than dwelling on the past, the collaboration explores how childhood experiences continue to shape identity long after people leave home.

“Those Days” Honors Okinawan Culture Through Music

The emotional depth of “Those Days” extends beyond the artists’ personal stories through its inclusion of “Child God (Heavenly Lullaby) [童神 (天の子守唄)]” by fellow Kadena-born singer Misako Koja.

A beloved song passed down through generations in Okinawa, the melody connects Ryusei Sakuma and OZworld’s individual memories to a broader cultural tradition shared by many people who grew up in the region.

Producer Seann Bowe gives the classic tune new life by reimagining it through an Island R&B and neo-soul sound, preserving its emotional warmth while introducing contemporary production that complements both artists’ performances.

Together, Ryusei Sakuma’s smooth vocals and OZworld’s reflective lyricism transform “Those Days” into more than a nostalgic hometown tribute. Built on lifelong friendship, shared memories, and Okinawan heritage, the collaboration turns deeply personal experiences into a story that resonates with listeners far beyond the island.

As Ryusei Sakuma continues to establish himself within Japan’s emerging Island R&B scene, “Those Days” stands out as one of his most personal releases yet, offering fans an intimate look at the memories, relationships, and hometown that helped shape both him and OZworld long before either artist found success in music.