One of the greatest anime monsters in the last decade is arguably Bocchilla from Bocchi the Rock! While the monster only appeared briefly in one episode of the series as a hallucination of main character Hitori Goto, it still left an impression on fans. That very monster was in Shimokitazawa, Tokyo on May 24 handing out flyers for the upcoming film and Zepp 2024 tour. But unbeknownst to fans, the person inside the costume was none other than Hitori Goto’s voice actor, Yoshino Aoyama.

The official X (formerly Twitter) account for the Bocchi the Rock! series announced the event on May 24. The initial post noted this was an “emergency flyer distribution” event and would begin at 6:00 p.m. that day at the Shimokita Senrogai Open Space. The tweet also noted a certain monster might also appear at the event.

◤￣￣￣￣￣￣￣￣￣￣￣￣￣

　　　緊急ビラ配布実施　　　

＿＿＿＿＿＿＿＿＿＿＿＿＿◢

🚨本日18時より下北沢にて
　 緊急ビラ配布会を実施！

◆場所
下北線路街 空き地 イベントスペース

さらに、あのモンスターが襲来…!?#ぼっち・ざ・ろっく pic.twitter.com/QwKIP5GGDc

— アニメ「ぼっち・ざ・ろっく！」公式 (@BTR_anime) May 24, 2024

◤￣￣￣￣￣￣￣￣￣￣￣￣￣
Emergency Flyer Distribution
＿＿＿＿＿＿＿＿＿＿＿＿＿◢

🚨An emergency flyer distribution event will be held in Shimokitazawa beginng a 6pm today!

◆ Location: Shimokita Senrogai Open Space event space

And that monster might attack…!?
#ぼっち・ざ・ろっく [Bocchi the Rock!]

True to the tweet’s word, Bocchilla made an appearance at the flyer distribution event. Comic Natalie‘s YouTube channel posted a short clip of the monster’s appearance.

━━━━━━━
緊急ビラ配布会
実施中！
━━━━━━━

後藤さんのグリーティング、
1回目が終了しました！

第2部は19:15～19:30に登場します🎈
ぜひお越しください🎸#ぼっち・ざ・ろっく pic.twitter.com/rw9PrGuIzU

— アニメ「ぼっち・ざ・ろっく！」公式 (@BTR_anime) May 24, 2024

━━━━━━━
Emergency flyer distribution
underway!
━━━━━━━

The first session of
Goto-san’s greeting is over!
The second part will be shown from 19:15 to 19:30🎈
Please come and visit us🎸
#ぼっち・ざ・ろっく [Bocchi the Rock!]

In a surprise twist, though, it was revealed after the event was over the person inside the Bocchilla costume wasn’t a staff member of the event. It was actually the voice of Hitori Goto, Yoshino Aoyama. A post on the Bocchi the Rock! X account unveiled Aoyama with a short TikTok video. In the video Aoyama had a short message for the fans, saying it was hotter than she imagined and asking how many people realized it was her.

【衝撃の事実】

キャスト解禁の瞬間。https://t.co/8IHI66m5l0#ぼっち・ざ・ろっく #青山吉能 pic.twitter.com/FreuISetlL

— アニメ「ぼっち・ざ・ろっく！」公式 (@BTR_anime) May 24, 2024

[Shocking Reveal]

The moment the cast was revealed.
https://vt.tiktok.com/ZSYYkpUc9/
#ぼっち・ざ・ろっく [Bocchi the Rock!] #青山吉能 [Yoshino Aoyama]

Aoyama also posted photos of her revealing she was Bocchilla all along on her X account. In the tweet, she asked her fans to share the photos and videos they took of her as Bocchilla with her.

まさかまさかの！
中の人が中の人になっていました🦖
皆さんが撮ってくれた承認欲求モンスターのお写真全部宝物にします！見せてくれ〜！心のいいね♡を押します#ぼっち・ざ・ろっく https://t.co/endnAOu0xA pic.twitter.com/Wm4kGnvbxk

— 青山吉能 (@Yopipi555) May 24, 2024

No way!
The person inside had become the person inside🦖
I will treasure all the photos you took of Bocchilla! Show me! I’ll give you a ♡ from my heart.
#ぼっち・ざ・ろっく [Bocchi the Rock!]

With the new film starting on June 7 and the Zepp Tour starting on September 8, this was a wonderful way to get the word out. Hopefully, in the future, Aoyama or maybe another cast member will dress up as Bocchilla for other Bocchi the Rock! events.

Sources: Bocchi the Rock! anime’s X/Twitter account (link 2, link 3), Yoshino Aoyama‘s X/Twitter account, Comic Natalie‘s YouTube channel