The Labyrinth city of Orario has a massive dungeon at its heart, filled with terrifying beasts. A new adventurer, Bell Crannel, challenges this perilous labyrinth, but not in hopes of finding treasure, but in hopes of picking up a girl.

Bell Crannel's power grows rapidly thanks to his ability, Realis Phrase. As long as he's in love with a girl, it will continue to make him stronger. His goddess, Hestia, is jealous that the girl he's in love with isn't her, but still wants to support him. She goes to another goddess and asks her to make him a powerful sword.

"I don't want to lose any more of my family." Bell and Hestia are attacked by an escaped monster during Monster Philia. Bell fights to save the only family he has left, but is overwhlemed by the monster.

"Excuse me, are you looking for a supporter?" After his rapid growth, Bell reaches the 7th floor of the dungeon. He gets new equipment and is ready to go when a girl named Lilika approaches him. She is a supporter, and her job is to aide adventurers in the dungeon.

With Lili's help, Bell is progressing further into the dungeon than ever. Since he can focus on the fights, he can make more money. But Lili has a secret: she despises adventurers, and is waiting for a chance to trick Bell.

Lili leads Bell deep into a dungeon and abandons him. He's alone and surrounded by larger monsters than he's ever faced. She runs off with his knife and makes for the exit, but her guild mates are waiting for her.

At Bell's urging, Hestia reluctantly lets Lili into the party. Bell, worried about his weakness as he continues to go deeper into the dungeons, accepts an offer of help from Aiz Wallenstein, the girl he loves.

For an adventurer to level up, and truly get stronger, he has to go on an adventure. Bell travels down to the lowest of the upper floors of the dungeon, where he encounters a minotaur with a giant sword. Lili is badly injured, and Bell is unable to leave her behind. Aiz arrives again to save him, but he waves her off...

Bell defeats the minotaur and becomes the fastest adventurer to level up in history. After his success, Bell is given the nickname "Little Rookie." As he sets his sights on the middle floors of the dungeon, Ryuu tells him that if he wants to succeed, he's going to need a bigger party.

The party is exploring on the middle floors when another group leads a huge train of monsters to them. They're overwhelmed and caught in a cave-in. Cut off from the upper floors, with limited supplies and little strength left, they are forced to make a desperate attempt to reach the safe zone even deeper in the dungeon.

After a great struggle, Bell and his party finally reach the 18th floor. Aiz Wallenstein and the Loki Familia are already there, returning from their expedition to the lowest levels of the dungeon. With the danger passed, they enjoy a short break before they head back up to the town.

A massive floor boss has crashed down from the upper floors and begun tearing apart the adventurers. Aiz has left for the surface, and it's up to Bell and his friends to defeat the monster. With their escape route cut off, it's do or die if they ever want to see the light of the sun again.

A massive floor boss falls from above and traps the adventurers. The only way out is up, and to get back home Bell will have to defeat it without Aiz's help.

Immediately after defeating Black Goliath, Bell and the others make their way to the surface when they come across a previously uncharted path leading to a mysterious hot spring.

Before the next chapter of the Familia Myth unfolds, Bell and Hestia take a moment to reflect upon their previous adventures.

Recap of First Season.

Sau khi đánh nhau với các thành viên của gia tộc Apollo, Bell thu hút sự chú ý của thủ lĩnh gia tộc đó – kẻ tuyên chiến với gia tộc Hestia.

Hestia không chấp nhận lời thách đấu của Apollo và bỏ đi. Nhưng đối thủ không sẵn lòng buông tha cho Bell dễ dàng như vậy và tấn công vào ngày hôm sau.

Sau khi Liliruca biết mình phải quay lại Soma, Hestia quyết định cứu cô. Trong khi đó, việc chuẩn bị cho Chiến Tranh Quyết Đấu với Apollo tiếp tục.

Các chiến hữu chúc Bell chiến thắng khi anh tham gia Chiến Tranh Quyết Đấu. Apollo dường như sắp thắng, nhưng mưu kế bất ngờ của Hestia mau chóng lật ngược thế cờ.

Sau khi hoàn thành Chiến Tranh Quyết Đấu, gia tộc ngày càng lớn mạnh chuyển đến dinh thự mới. Mầm họa từ quá khứ của Hestia ngăn cản kế hoạch của cô.

Mikoto bí mật lẻn ra gặp Chigusa, mà chẳng hề biết Bell và những người khác ở ngay đằng sau họ. Tất cả họ cùng đến một nơi đồi trụy.

Bell không thể ngừng nghĩ về hồ ly tinh Haruhime, nhưng việc cứu cô sẽ có nguy cơ khơi mào một cuộc Chiến Tranh Quyết Đấu khác, lần này là với gia tộc Ishtar hùng mạnh.

Việc Bell mạo hiểm để giải thoát Haruhime khiến cậu rơi vào cuộc phục kích của Ishtar, và cậu cùng Mikoto bị cầm tù. May mắn thay, ai đó trong nhà giam đã bí mật giúp họ.

Haruhime ở lại với Ishtar và nghi lễ ấn định số mệnh cô đã cận kề. Ngay khi mọi chuyện dường như đã an bài, bàn tay của Bell bắt đầu phát sáng.

Phryne lệnh cho Haruhime dùng năng lực của cô giải quyết triệt để mọi việc với Bell và cô tuân lệnh. Trong khi đó Freya tiếp tục dấn thân vào lãnh địa của Ishtar.

Dù Ares áp đảo về số lượng, cuộc chiến không suôn sẻ với gã chút nào. Hestia đau đầu vì mối quan hệ của Bell với thành viên mới nhất của họ, Haruhime.

Bell dừng chân ở Edas, nơi trưởng làng sẵn lòng giúp chăm sóc cho Hestia đến khi khỏe lại. Sau đó, anh được nghe truyền thuyết về Hắc Long.

Hestia, Lili and Haruhime waste no time trying to win Bell over with their charms and run into unexpected competition once Ais crashes the party. However, the usually stoic sword maiden is acting surprisingly carefree...

Monsters are evil abominations driven by murderous instinct. But if that were true, why is this one a scared little girl who doesn’t understand why she’s being hunted?

Who knows what could happen if word of Wiene’s existence spread. The Hestia Familia needs answers and soon, but what they discover in the dungeon only raises more questions...

The Guild knows about Wiene. But instead of demanding answers, it assigns the Hestia Familia a mission they cannot refuse. Something awaits them in the dungeon’s darkness.

There are others like Wiene, and they call themselves Xenos. Uranus asks much from the Hestia Familia, but if anyone can bridge the gap between species, it’s them.

It was supposed to be the dawning of a new era. But selfish, evil men only care about what they can take for themselves, leaving others to face the consequences.

Bell shouldn’t get involved. But the young adventurer has already decided otherwise. Little does he know that he’ll help Fels discover a secret even Uranus doesn’t know.

Never underestimate the measures a fanatic will take to prove his worldview correct.

The Loki Familia are battle-hardened veterans used to fighting monsters. But this opponent is different...

Although Ikelos has been successfully scapegoated, public opinion turns on Bell. Helping the Xenos will now prove impossible — but Hermes’ intel might just change the tide.

The surface is no longer safe for the Xenos. Now, the Hestia Familia must smuggle them back into the Dungeon. There’s just one problem: The Loki Familia stand in the way.

Bell WILL stay true to his ideals. Even if that means making an enemy of the woman he loves.

As Hermes finally reveals his true intentions, Bell battles the most powerful opponent he's ever faced.

Naaza had plans to build a bathhouse in Orario, but the Dian Cecht Familia beat her to it! And now they're calling it a natural hot spring!? This insult cannot stand.

What’s past is prologue. Bell has come a long way and he and Hestia reflect upon the events that forged him into the adventurer he is today.

Gather your party and venture forth, Bell. The dungeon awaits.

Bell and his party are making good time and will soon enter the lower floors. But the dungeon crawl is going too smoothly, and Cassandra cannot shake her earlier premonition.

The party has two options: either retreat to the surface with the injured or hunt the monster and hope its defeat will dispel the ailment. Both choices carry dire risks.

The party learns too late that the Moss Huge can use other monsters against them. Meanwhile, Bell is alone, but not without allies; the Xenos have not forgotten his kindness.

Haruhime’s new ability turns the tide of battle, but the Moss Huge has proven that it knows what it’s doing. As the party strategist, Lili has a hard choice to make.

Bell’s exploits have earned him fame and a new alias, and Lili worries that means change is coming. Meanwhile, Ryu left a note for her coworkers and vanished soon afterwards.

Ryu, the Gale Wind, stands accused of murder. Bell and his party need answers, but only Cassandra knows that tragedy will befall them if they pursue their friend.

Ryu couldn’t be the killer… right? Bell wants to help his friend, but as the body count grows higher, he must ask himself how well he truly knows her.

While Bell and Ryu contend with Jura and his insidious abilities, the rest of Bell’s allies uncover a barrel of bad apples in the dungeon’s dark depths.

Some monsters you must fight and from others you must flee. But beware the Juggernaut lest you simply cease to be.

The Juggernaut slaughters its way through a dwindling number of survivors, forcing Ryu to face her demons.

With retreat an impossibility, Bell’s party fight for their lives when a Floor Boss spawns early. However, they are all adventurers; they will not die so easily.

Critically wounded and trapped within the dungeon’s darkened depths, Bell and Ryu’s adventure is over. Their fight for survival has now begun.

The boss fight extracts a heavy toll on the party, and they must make a choice. If they go one way, they will live. But if they go the other? They will die.

The party narrowly survived, and now they must search for their missing friends. However, they’re facing more than just monsters; they’re fighting the Dungeon itself.

Bell and Ryu must cast reservations aside in the face of death. Meanwhile, Welf faces a trial by fire he cannot fail; lives are at stake.

Bell and Ryu’s relationship deepens as the trauma of the Deep Floors pushes them past their limits. They have each other, and that is the only reason they’re both still alive.

Hope glimmers in the darkness; the Xenos appear in the party’s hour of need, and Bell and Ryu make steady progress despite all odds. They may all survive this after all.

Their luck couldn’t last forever; Bell and Ryu must cross the Colosseum, where monsters constantly respawn. In the end, they may face an impossible choice…

It is too late for the Astrea Familia. Their story ends in tragedy, and this is the tale of how Ryu's life changed forever on that dark day.

Ryu’s feelings for Bell have changed in a way she cannot quite place. All she knows is that she cannot lose him; she just cannot.

After five years of grief, guilt and pain, Ryu finally faces a new path—a new justice. The Juggernaut should beware.