Sale front pages and dates

Steam Summer sale June 29 - July 13 10 AM PST

GOG Star Festival Sale June 07 - 16 10 PM UTC.

Has a bit more limited selection of games, but counts as a sale of JRPGs (especially Falcom ones) and Japanese games in general.

Most links below are from Steam, the GOG links are added next to them.

Great indies!

Ara Fell: Enhanced Edition (GOG) -70% $4.5
Bug Fables: The Everlasting Sapling (GOG) -50% $10
Chained Echoes (GOG) -20% $20
Cosmic Star Heroine (GOG) -75% $3.74
CrossCode (GOG) -70% $6
- CrossCode: A New Home DLC (GOG) -50% $4.5
Eastward (GOG) -40% $15
Epic Battle Fantasy 5 -20% $10
LISA: The Painful -20% $16
OMORI -25% $15
Undertale -70% $3; (GOG) - no discount on GOG, unfortunately
Wargroove -60% $8

KOEI TECMO

Atelier Mysterious arc
- Atelier Sophie / Firis / Lydie & Suelle bundle -51% $58.47
- Atelier Sophie -35% $26
- Atelier Firis -35% $26
- Atelier Lydie & Suelle -35% $26
- Atelier Sophie 2 -40% $26
Atelier Dusk arc
- Atelier Ayesha / Escha & Logy / Shallie bundle -51% $58.47
- Atelier Ayesha -35% $26
- Atelier Escha & Logy -35% $26
- Atelier Shallie -35% $26
Atelier Arland arc
- Atelier Rorona / Totori / Meruru bundle -51% $58.47
- Atelier Rorona -35% $26
- Atelier Totori -35% $26
- Atelier Meruru -35% $26
- Atelier Lulua -50% $30
Atelier Ryza arc
- Atelier Ryza -50% $30
- Atelier Ryza 2 -50% $30
- Atelier Ryza 3 -25% $45
Blue Reflection series
- BLUE REFLECTION -60% $24
- BLUE REFLECTION: Second Light -50% $30
FAIRY TAIL -40% $36
Toukiden Kiwami -60% $24

SEGA incl. Atlus

Yakuza / Like a Dragon series (GOG only discounts on 0-6!)
- Yakuza Complete Series (GOG) $35 - includes 0-6
- Yakuza 0 (GOG) -75% $5 - nice point to start the series with!
- Yakuza Kiwami (GOG) -75% $5
- Yakuza Kiwami 2 (GOG) -75% $5
- Yakuza 3 Remastered (GOG) -66% $7.5
- Yakuza 4 Remastered (GOG) -66% $7.5
- Yakuza 5 Remastered (GOG) -66% $7.5
- Yakuza 6 The Song of Life (GOG) -66% $7.5
- Yakuza: Like a Dragon (Steam) -75% $15 - nice point to start the series with!
- Like a Dragon: Ishin (Steam) -30% $42
Judgment series (Bundle -46% $70)
- Judgment -40% $24
- Lost Judgment -40% $36
Shenmue series
- Shenmue I-II -80% $6
- Shenmue III (GOG) -85% $4.5
Persona series
- Persona 3 Portable -25% $15 (maybe wait for Persona 3 Remake?)
- Persona 4 Golden -25% $15
- Persona 5 Royal -40% $36
Soul Hackers 2 -40% $36
Catherine Classic -75% $5 (NB! Doesn't include content from Catherine Full Body, e.g. Qatherine)
Valkyria Chronicles series
- Valkyria Chronicles -75% $5
- Valkyria Chronicles IV -80% $10

Nihon Falcom games (publ. by XSEED, Aksys, NIS America, Mastiff)

Trails in the Sky
- Trails in the Sky First Chapter (GOG) -50% $10 - nice point to start the series with!
- Trails in the Sky Second Chapter (GOG) -35% $20
- Trails in the Sky 3rd (GOG) -25% $22.5
Trails Crossbel duology
- Trails from Zero (GOG) -32% $20 - nice point to start Trails series with!
- Trails to Azure (GOG) -36% $10
Trails of Cold Steel
- Trails of Cold Steel I (GOG) -50% @20 $ - nice point to start Trails series with!
- Trails of Cold Steel II (GOG) -50% $20
- Trails of Cold Steel III (GOG) -60% $24
- Trails of Cold Steel IV (GOG) -40% $36
Ys series - start with either one, the order doesn't matter
- Ys I + II Chronicles (GOG) -70% $4.5
- Ys: The Oath in Felghana (GOG) -70% $4.5
- Ys Arc of Napishtim (GOG) -75% $5
- Ys Origin (GOG) -75% $5
- Ys SEVEN (GOG) -40% $15
- Ys: Memories of Celceta (GOG) -40% $15
- Ys VIII: Lacrimosa of DANA (GOG) -55% $18
- Ys IX: Monstrum Nox (GOG) -30% $42
Tokyo Xanadu eX+ (GOG) -80% $12
Xanadu Next (GOG) -50% $7.5
Zwei series
- Zwei: The Arges Adventure (GOG) -40% $9
- Zwei: The Ilvard Insurrection (GOG) -50% $10
Gurumin: The Monstrous Adventure -70% $3; (GOG) - no discount on GOG

Notes:

Releases of Trails and Ys from NIS America and XSEED are usually DRM-free even on Steam, especially the older ones.
For Trails series in Korean and Chinese, see Clouded Leopard Entertainment homepage, which also has discounts
In August 2021, NIS America removed regional prices on GOG for many games, making prices in countries like Brasil, South Africa, and Russia match the prices in dollars. The regional prices on Steam are still there.

BANDAI NAMCO

Tales of series
- Tales of Symphonia -75% $5
- Tales of Vesperia -80% $8
- Tales of Zestiria -90% $5
- Tales of Berseria -90% $5
- Tales of Arise -60% $24
Sword Art Online series
- SAO: Fatal Bullet -80% $8
- SAO: Alisization Lycoris -80% $10
- SAO: Hollow Realization -85% $8
- SAO: Lost Song -85% $3
FROM SOFTWARE (Dark Souls series, Elden Ring)
- Dark Souls Remastered -50% $20
- Dark Souls II -50% $20
- Dark Souls III -50% $30
- Elden Ring -30% $42
Dragon Ball Z: Kakarot -75% $15
Little Witch Academia: Chamber of Time -65% $14
God Eater 3 -85% $7.5
Digimon World: Next Order -35% $32.5
Scarlet Nexus -75% $12.5
One Piece Odyssey: Deluxe Edition -35% $55 (For some reason, they made a discount on the Deluxe editon only. The normal one is still at $60)

CyberConnect2 (incl. .hack// games published by Bandai Namco)

Fuga: Melodies of Steel -40% $24
.hack//G.U. Last Recode -85% $7.5

Square Enix

Final Fantasy series
- III 3D Remake, IV 3D Remake -50% $8
- VII -50% $8
  - VII Remake Intergrade -43% $40
  - Crisis Core: Final Fantasy VII Reunion -30% $35
- VIII -50% $6
  - VIII Remastered -50% $10
- IX -50% $10.5
- X + X-II Remaster -50% $12.5
- XII -50% $25
- XIII -50% $6.5
  - XIII-II -50% $8
  - XIII: Lightning Returns -50% $8
- XV -50% $17.5 (NB: has Denuvo)
- Type-0 HD -60% $10
- Stranger of Paradise: Final Fantasy Origin -30% $28
- World of Final Fantasy -60% $10
Chrono series
- Chrono Trigger -50% $7.5
- Chrono Cross: The Radical Dreamers Edition -30% $14
Mana series
- Secret of Mana -50% $20
- Trials of Mana -50% $25
- Legend of Mana -50% $15
Star Ocean series
- Star Ocean: The Last Hope -60% $8.4
- Star Ocean: The Divine Force -40% $36
Octopath Traveller series
- Octopath Traveller -50% $30
- Octopath Traveller II -25% $45
Bravely Default II -50% $30
Dragon Quest XI S: Echoes of the Elusive Age -35% $26
LIVE A LIVE -30% $35

Note: Too many games to list! Refer to their sale page for more

NIS America excl. Falcom games

Disgaea series
- Disgaea PC -80% $4
- Disgaea 2 PC -80% $4
- Disgaea 4 Complete -60% $16
- Disgaea 5 Complete -75% $10
- Disgaea 6 Complete -20% $48
The Caligula Effect series
- The Caligula Effect: Overdose (GOG) -70% $15
- The Caligula Effect 2 -50% $25
Langrisser I+II -60% $20
The Alliance Alive HD Remastered (GOG) -70% $12

Note: In August 2021, NIS America removed regional prices on GOG for many games, making prices in countries like Brasil, South Africa and Russia match the prices in dollars.

XSEED Games / Marvelous Europe excl. Falcom games

Rune Factory series
- Rune Factory 4 Special -35% $20
- Rune Factory 5 -50% $25
Touhou: Scarlet Curiosity -40% $9
Trinity Trigger -20% $40; (GOG) - no discount on GOG
Sakuna: Of Rice and Ruin -40% $18

Compile Heart / Idea Factory

Neptunia series
- Hyperdimension Neptunia Re;Birth1 (GOG) -65% $5.24
- Hyperdimension Neptunia Re;Birth2: Sisters Generation (GOG) -65% $5.24
- Hyperdimension Neptunia Re;Birth3: V Generation (GOG) -65% $5.24
- Megadimension_Neptunia_VII R (GOG) -70% $7.5
- Super Neptunia RPG (GOG) -75% $7.5
- Neptunia Virtual Stars (GOG) -80% $8
- Cyberdimension_Neptunia: 4 Goddesses Online -70% $7.5
- Neptunia: Sisters vs Sisters -25% $37.5
Fairy Fencer series
- Fairy Fencer F Advent Dark Force (GOG) -65% $5
- Fairy Fencer F Refrain Chord -30% $35
Death End Re;Quest series
- Death End Re;Quest -75% $7.5; (GOG) - no discount on GOG
- Death End Re;Quest 2 (GOG) -70% $12 - there is a discount on GOG! o_o

Note: There are so many Neptunia games and spin-offs so you better look at the publisher's page. Some games contain nudity.

Spike Chunsoft

Made in Abyss: Binary Star Falling into Darkness -60% $24
Crystar -70% $18

UPD:

07/01: all finished! Also removed affiliate links from SteamDB and GOGDB
07/08: Replaced GOG Summer Sale with GOG Festival sale