https://figureskate-soi.com/
Dates for the Yokohama shows are April 22-25, 2021.
Cast (as of April 2):
https://figureskate-soi.com/skaters.html
Additional skaters as of April 13:
Yoshio Miura (2020 All Japan Junior Championship Men's Silver Medalist)
Sena Miyake (2020 All Japan Junior Championship Men's Bronze Medalist)
Yuhana Yokoi (2019 Finlandia Trophy Bronze Medalist)
Mako Yamashita (2018 Skate Canada Silver Medalist)
Rin Nitaya (2019 All Japan Championship 7th)
Sunday 4/25 Performance will have a livestream (not archived) for a fee of 3000 yen:
https://figureskate-soi.com/ticket.html
Hachinohe shows [Wed.-Fri., April 28-30, 2021] were announced a few days ago:
https://figureskate-soi.com/kg/
Last year the stop in Hachinohe was planned as the very first event in the new venue last year, but later cancelled.
The cast is different from Tokyo shows, e.g No Uno and Kagiyama, but with Koshiro and Miura/Kihara.
As of April 8:
Yuzuru Hanyu
Takahito Mura
Shun Sato
Kazuki Tomono (Appears only on April 28 and 29)
Koshiro Shimada
Sota Yamamoto
Sena Miyake
Sumitada Moriguchi (2019 All Japan Championship Men 12th)
Lucas Tsuyoshi Honda (2020 All Japan Junior Championship Gold Medalist)
Shunsuke Nakamura (2020 All Japan Junior Men's Championship 6th)
Satoko Miyahara
Wakaba Higuchi (Appears only on April 28 and 29)
Rika Kihira
Kaori Sakamoto
Mai Mihara
Rino Matsuike (2020 NHK Trophy Bronze Medalist)
Mana Kawabe (6th place in the 2020 NHK Trophy)
Yuhana Yokoi
Mako Yamashita
Rin Nitaya
Hana Yoshida (2020 All Japan Junior Championship Silver Medalist)
Mao Shimada (2020 All Japan Junior Championship Bronze Medalist)
Misato Komatsubara & Takashi Komatsubara
Riku Miura & Ryuichi Kihara