In the world of the light novel series " In Another World with My Smartphone ," the Kingdom of Belfast
is a primary setting where the protagonist, Touya Mochizuki, begins his life after being reincarnated by God with a supernaturally enhanced smartphone.
The story of "Adventuring with Belfast" follows Touya as he navigates high-stakes political intrigue and fantastical quests within this kingdom. The Poisoned King and the Hero's Arrival
The narrative arc in Belfast begins when King Tristwin Ernes Belfast is poisoned in a regicide attempt. Touya is brought to the royal capital by Duke Alfred, the King's brother, to use his unique magic and smartphone apps to save the monarch.
The Cure: Touya successfully cures the King and uses his technology to identify the true mastermind: Count Balsa, a corrupt aristocrat who attempted to frame an ambassador from the neighboring Kingdom of Mismede.
A Royal Proposal: Impressed by his power and character, the King’s daughter, Princess Yumina Ernea Belfast, falls in love with Touya and declares her intent to marry him, joining his adventuring party to see the world. Adventuring Beyond the Palace
Once Yumina joins the party, the story shifts from political drama to classic fantasy exploration.
The Guild and the Great Ape: Yumina registers at the Adventurer Guild in Reflet Town. Her first major mission involves a subjugation quest for "Great Apes" in the South Forest, where she demonstrates her expertise with bows and summoning magic.
Divine Summons: During their travels, Yumina teaches Touya about summoning magic, leading him to accidentally summon Kohaku, the White Tiger and one of the four divine beasts. World Building: The Kingdom of Belfast
Belfast is depicted as a pseudo-medieval nation that becomes a hub for "modern" culture introduced by Touya.
Technological Shift: Through Touya's influence, Belfast becomes the first place in its world to experience inventions like ice cream, shogi boards, and bicycles.
Foreign Relations: Initially tense due to historical wars with the Regulus Empire and racial prejudice toward the beastmen of Mismede, Belfast eventually becomes a leader in a new world alliance brokered by Touya. Yumina Ernea Belfast/Relationships
"Adventuring with Belfast in Another World V01" likely refers to the first volume of the "Kingdom of Belfast" story arc in the popular light novel and manga series, In Another World With My Smartphone. This arc introduces the Kingdom of Belfast and its royal family, specifically Princess Yumina Ernea Belfast, who becomes a central character and the protagonist's first fiancée. The Journey to Belfast
The story follows 15-year-old Touya Mochizuki, who is accidentally killed by God and reincarnated into a fantasy world as an apology. Gifted with enhanced physical and magical abilities, as well as his original smartphone, Touya eventually finds himself in the Kingdom of Belfast.
The Royal Crisis: Touya’s arrival in Belfast is marked by a high-stakes medical emergency. He is brought to the royal castle to save the King of Belfast, who has been lethally poisoned. adventuring with belfast in another world v01
A Heroic Intervention: Using his unique magic—the same spell he previously used to cure blindness—Touya successfully purifies the King and identifies the assassin behind the plot. Princess Yumina Ernea Belfast
Princess Yumina is arguably the most significant figure introduced in the Belfast arc. Her role in Volume 1 sets the foundation for the series' romantic subplots and adventuring party dynamics.
The Proposal: Grateful for her father’s life and impressed by Touya’s character, Yumina shocks her family and Touya by proposing to him on the spot.
Abilities: Yumina is not just a royal figurehead; she is a skilled adventurer. She possesses rare magic, including the ability to see several seconds into the future and aptitude for summoning magic. She is also highly proficient with long-range weapons like bows and guns. World-Building and Lifestyle
The Belfast arc is known for its "cozy" world-building, where Touya introduces modern concepts to a medieval setting.
Cultural Innovations: During his time in Belfast, Touya introduces the kingdom to ice cream, shogi, and the very first bicycle in that world.
The Belfast Mansion: As a reward for his services, Touya is gifted a large European-style mansion in Belfast’s West District. This location serves as the group's primary base of operations before they later move to the Brunhild Dukedom. Volume 01 Themes
Lighthearted Adventure: Unlike darker "isekai" stories, the adventuring in Belfast focuses on humor, simple problem-solving, and building a supportive cast of friends.
Political Relations: Volume 1 touches on Belfast's diplomatic history, including its past wars with the Regulus Empire and its eventually mended relations with the Kingdom of Mismede.
Kingdom of Belfast | In Another World With My Smartphone Wiki
Adventuring with Belfast in Another World v01 " appears to be an unofficial or fan-created adult game project inspired by the In Another World With My Smartphone (Isekai wa Smartphone to Tomo ni) light novel and anime series.
The project focuses specifically on the Kingdom of Belfast, one of the primary settings in the original series where the protagonist, Touya Mochizuki, establishes significant royal connections. Project Overview
The "v01" version likely represents the initial full release or a major milestone following early development builds like v0.5.
Source Material: The game is based on the Kingdom of Belfast from the light novel series In Another World With My Smartphone. In the world of the light novel series
Characters: Key figures likely include Yumina Ernea Belfast (the crown princess), King Tristwin, and Queen Yuel.
Themes: Based on developer logs, the game includes "Vanilla" and "NTR" (Netorare) roleplay scenes and CG art. Setting: The Kingdom of Belfast
In the original lore, Belfast is a pseudo-medieval fantasy world that recently modernized through the protagonist's influence.
Military: Divided into the regular Army (for defense and invasion) and the Knight Order (for domestic law and order).
Diplomacy: Historically hostile toward the Regulus Empire but friendly with the Refreese Imperium. Key Locations:
The Royal Castle: Located in the capital, where the royal family resides.
Belfast Mansion: A three-story European-style house gifted to the protagonist. Core Characters to Expect Belfast Mansion | In Another World With My Smartphone Wiki
The story begins with Haruto Amakawa, a mid-level corporate analyst in Tokyo—intelligent, loyal, but deeply unfulfilled. After dying in a train accident while protecting a child, he expects oblivion. Instead, he awakens in a summoning circle, not as a legendary hero, but as an "irregular" in the kingdom of Eldelheit.
However, something is wrong. The summoning spell fractured. Haruto didn’t arrive alone.
Manifesting beside him, in a swirl of azure rigging and polished silver, is Belfast—the famous Aurora-class light cruiser, now in her humanoid "ship girl" form. Confused but poised, Belfast immediately assesses the situation with her signature line: "I’m Belfast. Let me take care of everything."
Unlike most isekai protagonists, Haruto has no combat skills, no magic stat screen, and no legendary weapon. His only asset? Belfast. Her tactical rigging, cannons, and radar are anachronisms in a medieval fantasy world—but that doesn’t make them any less devastating.
Adventuring with Belfast in Another World Vol. 01 is a surprisingly grounded, well-paced start to a niche crossover series. It respects the source material (Azur Lane’s Belfast is faithfully characterized) while building a fresh isekai logic around her abilities. Haruto is a refreshingly competent-but-not-overpowered lead, and their mutual dependence feels earned, not forced.
The volume’s only weakness is a slow middle section where the duo runs fetch quests to earn gold for ammunition—a necessary worldbuilding step, but one that drags slightly.
Rating: ⭐⭐⭐⭐ (4/5) – A promising launch. Belfast fans will adore it; isekai skeptics may be pleasantly surprised. The Premise: A Different Kind of Summoning The
Where to Start: The light novel is available in English from Seven Seas Entertainment. No anime adaptation has been announced as of this writing, but fan demand is high.
So set sail, prepare the tea, and remember: In a world of magic and monsters, sometimes the most dangerous thing you can hear is a maid politely asking, "May I open fire?"
Beneath the monster slaying and tactical gunplay, Adventuring with Belfast in Another World V01 explores three profound themes:
If you are a fan of Azur Lane, The Saga of Tanya the Evil (for its tactical focus), or Dr. Stone (for its science-versus-magic angle), then "Adventuring with Belfast in Another World V01" is an essential addition to your library.
It respects its source material while boldly charting a new course. Belfast is not merely fan service; she is a character with depth, trauma, and a quiet dignity. Kaito is not a self-insert; he is a specialist in crisis. Together, they form one of the most compelling duos in recent isekai history.
Volume 01 ends on a perfect cliffhanger: Kaito, having drawn a schematic for a simple paddlewheel boat, looks at Belfast and asks, "If I can build you a hull… could you teach Eferia how to sail?"
Belfast’s response, delivered with a rare smile: "Commander. It would be my honor."
The horizon, for the first time in this waterless world, looks wide open.
Rating: ★★★★½ (4.5/5) Tags: Isekai, Military Fantasy, Slow Burn, Adventure, Slice-of-Life with Explosions.
Prepare to weigh anchor. The land is only the beginning.
Have you read "Adventuring with Belfast in Another World V01"? Share your thoughts on the dynamic between Kaito and Belfast in the comments below. And stay tuned for our preview of Volume 02: "The Shadow Currents."
The heart of the volume is the relationship between the two leads.
The "romance" is extremely light in this volume, playing out more as a deep mutual trust. It is a wholesome partnership that prioritizes companionship over fan service.
The fantasy world, Alfheimr, is standard on the surface (guilds, dungeons, demon lords), but the author cleverly contrasts magical systems with Belfast’s 20th-century technology. Magic requires incantations and mana; Belfast’s cannons use physical shells. Magic detection spells fail against her radar jamming. Healing potions can’t repair her steel hull—so Haruto must learn alchemical metallurgy.
This creates unique stakes. Belfast is powerful but not invincible. She has limited ammunition (resupplied via a mysterious "dock space" she carries), and her fuel gauge becomes a recurring narrative tension.