Inside the 2.5D Phenomenon: How Sutopuri Celebrated 10 Years with a 150,000-Strong Arena Tour and Historic ‘a-nation’ Announcement

Executive Overview

In the rapidly evolving landscape of modern Japanese entertainment, few entities have bridged the chasm between digital subculture and mainstream pop dominance as successfully as the 2.5D idol group Sutopuri (Strawberry Prince). On August 20, 2026, the group reached a monumental milestone, concluding their highly anticipated tenth-anniversary arena tour, “Strawberry Memory Vol. 10th anniversary ~Sutopuri ARENA TOUR~.” The tour’s grand finale took place during a three-day residency from August 18 to August 20 at Tokyo’s historic Yoyogi National Stadium First Gymnasium, drawing the curtain on a massive 13-performance run across four major Japanese cities.

By the time the final notes faded in Tokyo, the tour had accumulated an aggregate attendance of approximately 150,000 fans—referred to affectionately by the group as "listeners." This milestone not only commemorates a decade of survival and growth in a highly volatile market but also solidifies Sutopuri’s position as the undisputed pioneer of the 2.5D idol business model.

Blending virtual anime avatars for online content with physical, face-revealing live performances, the group’s agency, STPR Inc., has engineered a lucrative ecosystem. This exhaustive investigative report dissects the tour’s final performance, analyzes the group’s decade-long commercial trajectory, details major strategic announcements, and projects their future in an increasingly digitized entertainment industry.

Detailed Chronology of the Yoyogi Grand Finale

Act I: The Royal Descent and the Symphony of Gratitude

The atmosphere inside the Yoyogi National Stadium First Gymnasium on August 20, 2026, was charged with anticipation. Before the lights dimmed, the crowd was treated to a playful "shadow announcement" (pre-show audio) by members Rinu and Root, instantly sending a wave of excited chatter through the arena.

As the house lights plunged into darkness, the passage of a decade was felt through a ticking clock sound effect that echoed throughout the cavernous gymnasium. A massive white curtain draped over the front of the stage became the canvas for a beautifully animated sequence projected onto giant LED screens. The animation chronicled the origins of each member—Rinu, Root, Colon, Jel, and Satomi—depicting their births, their individual struggles, and the fateful internet encounters that bound them together.

[Ten-Second Visual Countdown]
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[Spotlights Illuminate the Arena Ceiling]
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[Crown-Shaped Gondolas