there are no affordable options. If you want a quality coach, you have to pay him the market rate.
For around 5,500 yens / hour you can already have a good coach. rate can go up to 8,000 yens/hour for top coaches.
UPTY doesn't exist anymore.
a lot of good coaches have departed from LILI, and the school itself has also split in 2. I can still recommend the main coach MURATA but his schedule is busy and his rate is a bit more expensive.
you have many good coaches and availability at Yoyo Takkyu
https://www.yoyo-takkyu.com/ including some former JNT female players (WAKAMIYA, FUJII, ISHIGAKI)
I can also recommend HIRAYA who plays sometimes in Bundesliga, if you want to play with a chopper. he is in Shakehands,
https://www.shands.jp/club/services. Bonus: he will provide a short video after the lesson to recapitulate, and there is a shower (pay extra) at his club.
Its not very central, you can also go to Ariake to play with Coach Hidetoshi OYA, a former JNT player
https://seiyatts-ariake.com/ . Sometimes , during holidays or long weekends they organize all-day or multiday training sessions for groups. I think its worth it because the players who go there are motivated and good.
I don't recommend group lessons in private schools in Japan. The level is not so high and you got very little time with the coach. I think 1 hour of private lesson is worth many hours of group lessons.
I can also recommend playing in tournaments !!! there are round-robin tournaments, no elimination at p4match.com
Otherwise if you want to train but you're cheap, just go to a Local Sports Center, and find partners !