id,content_id,series_id,parent_content_id,level,content_type,product_type,title,alt_titles,subtitle,display_title,display_title_short,description,description_short,image_id,display_order,listed_at,label_id,geoblock_id,display_name,copyright,on_presale_at,on_sale_at,off_sale_at,add_on,add_on_campaign_only
PRD_05ZQZS9SMJ30,CNT_0JEWYBFSQHRG,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 1,[],,Only I Know that This World Is a Game: Volume 1,,"One day, Souma Sagara, a college student and hardcore gamer who puts his hobby above everything else, finds himself sucked into his current game of choice—New Communicate Online, aka the Catfolk Realm. But what seems like a dream come true could easily turn into an unmitigated tragedy, as the game is infamous for being a buggy mess coded by malicious developers!

Robbed of his ability to save, reload, or access any of the game's features, Souma must take on the Catfolk Realm with nothing but his wits and in-depth knowledge of how the game works, bugs and all. Follow along as he interacts with various NPCs, breaks quests, and glitches his way to success in a world where a single game over means certain death!","One day, Souma Sagara gets sucked into the world of New Communicate Online, aka the Catfolk Realm. Too bad the game is a buggy mess by malicious developers! He'll need his wits and all the glitches he can abuse to survive in this game world!",01KH3F82JZXP4MDXWTD5P3EEA1,1.0,2023-06-16T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 1,Copyright © Ichizen 2014 © Usber 2014,,2023-08-02T07:00:00.000Z,,0,0
PRD_0PV902FZPQ80,CNT_1ND6FHXRGJ70,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 2,[],,Only I Know that This World Is a Game: Volume 2,,"""Souma Sagara, a loner college student who finds himself teleported into his favorite—albeit buggy—RPG, doubles down on his bizarre circumstances and decides to make use of all the glitches, bugs, and secrets he knows to hack his way to victory. After all, failure in the game can lead to a very real death for this hapless hero!

Joined by the disastrous damsel Miss Train, an NPC programmed to kill anyone spending too much time power leveling, Souma does what gamers do best: bend the rules to min-max every stat he can!""",After waking up in the Catfolk Realm—an RPG (in)famous for being a buggy mess—Souma Sagara makes the most of his situation by taking on secret dungeons. He might even add some NPCs to his party along the way!,01KGASMS3H220J8MXFC33XJG5Q,2.0,2023-09-20T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 2,Copyright © Ichizen 2015 © Usber 2015,,2023-10-18T07:00:00.000Z,,0,0
PRD_0ZP3TTBYDQA0,CNT_1QJWBFWVSTFG,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 4,[],,Only I Know that This World Is a Game: Volume 4,,"Souma Sagara escapes from Ramrich in the way he knows best—by exploiting any loophole he can find—and touches down in the royal capital! He can't rest easy, though, as danger lurks around every corner. And his momentary, blissful freedom is soon interrupted by a mysterious blue-haired girl who suddenly appears before him. Will Souma be able to solve the mystery of her identity? More importantly, can he find a way to earn enough cash to prevent an early game over? Get ready for phase two of the loner adventurer's RPG journey!","It's goodbye Ramrich and hello royal capital as Souma takes his next step forward! But who's this mysterious blue-haired girl, and where in the world did she come from? Get ready for phase two of the loner adventurer's RPG journey!",01KH3R9YFTPMM11WD4WRRVSE33,4.0,2024-05-09T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 4,Copyright © Ichizen 2016 © Usber 2016,,2024-05-29T07:00:00.000Z,,0,0
PRD_1J97C9TFSNPG,CNT_3S8WAHEWYX5G,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 10,[],,Only I Know that This World Is a Game: Volume 10,,"With his preparations complete, it is time for Souma and his friends to bring the fight to the demon lord! Anything can happen in the Catfolk Realm, so he needs to make sure his strategy is watertight. However, a question lies under the surface: Will he and Maki be able to return home? Keep your eyes peeled as the loner gamer's journey reaches its much-anticipated conclusion!",The time has come for the battle with the demon lord! What strategy has Souma cooked up to win? Will he and Maki be able to return home? Stay tuned for the conclusion of the loner gamer's journey!,01KGC17Y4H0QTRAG9YN0JNG6NF,10.0,2025-10-30T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 10,Copyright © Ichizen 2023 © Usber 2023,,2025-11-19T08:00:00.000Z,,0,0
PRD_2Y4GJC5DGGX0,CNT_1MZXBEZTYYBG,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 9,[],,Only I Know that This World Is a Game: Volume 9,,"The capital is safe and sound! Unfortunately, Souma can't rest on his laurels for too long. Miss Train has left Ramrich and is on her way to the capital when an accident happens. Souma will need to rack his brain for any possible strat to save her... At the same time, he also needs to start preparing for the upcoming showdown with the demon lord! Get ready for the final act in the loner gamer's adventure!","The battle for the capital ends in Souma's victory! However, he can't rest for too long. Miss Train has finally left Ramrich to see him, but she runs into some trouble on the way... Can any of Souma's strats save her?",01KGBTH4A5VRKQZZN2718ZKEJ8,9.0,2025-07-31T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 9,Copyright © Ichizen 2021 © Usber 2021,,2025-09-10T07:00:00.000Z,,0,0
PRD_388ZK2Y5J0C0,CNT_1R79MZ6W8480,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 5,[],,Only I Know that This World Is a Game: Volume 5,,"It's time for the Gold Loner Nolime hunt, and Souma is hoping to hit the jackpot and be set for life! The arrival of Mitsuki Hisame threatens his get-rich-quick scheme, but he's got a slew of unconventional techniques at his disposal, so he refuses to give up. Nothing is ever easy for Souma, though, and there's even more unexpected trouble on the horizon... Will the savvy player be able to use the tricks up his sleeve to avoid an early end to his adventure?","It's time for the Gold Loner Nolime hunt, and Souma is hoping to hit the jackpot! But when some of the Catfolk Realm's biggest names show up, will he be able to come out on top?",01KGBCB2HJKQPC3M87DQY1D5RF,5.0,2024-08-20T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 5,Copyright © Ichizen 2017 © Usber 2017,,2024-09-18T07:00:00.000Z,,0,0
PRD_39YQG1ZGWJNG,CNT_1905T4Y0RHH0,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 7,[],,Only I Know that This World Is a Game: Volume 7,,"With every NPC spouting the same dialogue, Souma has no choice but to follow Mitsuki and head to the Hisame Dojo. There, he will face an infamously difficult quest: The Trials of the Hisame Family. Not only will he have to survive three days of death-defying battles, but the quest will culminate in a battle against the family head, Asahi Hisame! In the face of Asahi's unbeatable spear, Souma will have to find some way to stay alive. Just what scheme will he cook up for his showdown with the indomitable Asahi?","Left with no choice, Souma arrives at the Hisame Dojo, where he will face his toughest trial yet. If he can survive three days of death-defying battles, he'll need to defeat the clan's indomitable master: Asahi Hisame!",01KGBMH53F8VQM31MG1FH90SR4,7.0,2025-03-11T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 7,Copyright © Ichizen 2019 © Usber 2019,,2025-04-02T07:00:00.000Z,,0,0
PRD_3RT3XFVB2TPG,CNT_3JFQ8RQ8JT0G,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 3,[],,Only I Know that This World Is a Game: Volume 3,,"Souma Sagara is a loner university student who gets teleported into his favorite—albeit buggy!—RPG. There, he encounters one of the most powerful NPCs in the game...but not, contrary to their many previous run-ins, as an ally. This time, they face off in a battle to the death! However, this is no simple matter of a game over meaning lost progress. Dying in-game meansSouma will be gone for good!

Together with Miss Train, Souma's new NPC party member and partner in crime, he sets off on an adventure to defeat the Demon God before it can bring the game to an early and very unfortunate conclusion.","Souma Sagara is living his fantasy life inside a game! Joined by Miss Train, an NPC who punishes players for power leveling, he squares off against powerful NPCs and even the Demon God to fight for experience, money, and ultimately his life!",01KG9PKQ37CNX3ZZ6J0VCMCDMH,3.0,2024-01-16T08:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 3,Copyright © Ichizen 2016 © Usber 2016,,2024-02-07T08:00:00.000Z,,0,0
PRD_3RZ2D3PRVX20,CNT_2J70A8N8QFH0,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 6,[],,Only I Know that This World Is a Game: Volume 6,,"The results of the Gold Loner Nolime Hunt are in, and Souma has struck it stupidly rich! But while being a multimillionaire is grand, money can't solve all his problems. Unable to accept that he beat her once again, Mitsuki Hisame pursues him with a request to visit her family dojo. Souma has no intention of joining her, though, and decides to settle things with one final duel. Will his victory be enough to dissuade her at last?","The results of the Gold Loner Nolime Hunt are in, and Souma has struck it stupidly rich! Money can't solve all his problems, though. How will he deal with Mitsuki's constant requests to visit her family dojo?",01KGBHPV6ZCQQHSZFQXHWR0RNH,6.0,2024-11-13T08:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 6,Copyright © Ichizen 2017 © Usber 2017,,2024-12-11T08:00:00.000Z,,0,0
PRD_3VXQDGSM2P30,CNT_1A8PK6WKQTCG,CNT_1B0JXK7N61V0,CNT_1B0JXK7N61V0,2,1,1,Volume 8,[],,Only I Know that This World Is a Game: Volume 8,,"Souma has completed the Trials of the Hisame Family! He heads to the baths for a well-deserved rest and starts planning his next moves. But the Catfolk Realm is as unpredictable as ever. Suddenly, the demon lord's army marches on the capital, ready to begin its assault! With some new weapons and renewed trust in the allies he's made, Souma readies himself for an epic confrontation. Can he protect Maki and his new friends?","With the Trials of the Hisame Family behind him, Souma is planning his next moves. Suddenly, the demon lord's army marches on the capital, ready to begin its assault! Can Souma protect Maki and his new friends?",01KGBPFF74CC5R10HE6GWZGDME,8.0,2025-05-14T07:00:00.000Z,LAB_30X9NTZYDFV0,GEO_1PQM5BDYSMG0,Only I Know that This World Is a Game: Volume 8,Copyright © Ichizen 2020 © Usber 2020,,2025-06-18T07:00:00.000Z,,0,0