Idle Slayer X Attack on Titan: Case Study

How Attack on Titan IP Supercharged Idle Slayer’s Community Growth and Engagement with Yodo1’s Mediation

We watched it, you probably watched it — at this point, the whole world seems to have watched Attack on Titan. And even if you somehow missed the anime, you might have come across Idle Slayer during its month-long Attack on Titan integration in the summer of 2024.

Why are we so sure? Because during the event, Idle Slayer’s downloads jumped by 70%, and new users grew by 72% — a clear sign that the collaboration reached far beyond the core fanbase.

How did we create such a massive wave of engagement together with Pablo Leban and Kodansha Ltd.? We broke it down below, covering:

• Background on the game and the IP
• Integration overview
• Key results
• Yodo1’s mediation role

About the Game and the IP

It’s easy to hurt a game by choosing the wrong IP for a collaboration, but when the match is right, it can genuinely boost community growth and revenue. Here’s why pairing Idle Slayer with Attack on Titan worked so well.

Game: Idle Slayer by Pablo Leban

Idle Slayer is an incremental game where players collect coins and defeat enemies to purchase upgrades and increase their earnings. As players progress, they unlock mini-games and new playstyles that keep the experience fresh and engaging.

There’s just one person behind Idle Slayer — Pablo Leban. He’s known for developing the game solo and using player feedback to shape its evolution.

IP: Attack on Titan by Kodansha Ltd.

Not long ago, it felt like everyone was watching Attack on Titan. It began as a manga published by Kodansha and expanded into a blockbuster anime, films, and video games. Its distinctive visual identity — giant Titans, military regiments, a grim atmosphere, and twist-heavy storytelling — built a passionate global fanbase.

Kodansha Ltd. is a Japanese publishing house known for owning some of the world’s most prominent IPs, publishing everything from manga to books and magazines.

Overview of the Integration

Event period and promotion

The event ran in Idle Slayer from July 1 to July 31, 2024, and was available globally.

How the characters entered the world

During a Scout Regiment mission, Attack on Titan protagonists Eren, Mikasa, Levi, and Armin are suddenly pulled into the Idle Slayer world through a portal opened by an ancient treasure — with fearsome Titans following behind. To stop the Titan threat and help the heroes return home, Idle Slayer’s main character teams up with them on a new adventure.

Integration content

Idle Slayer released a major content update featuring:

• 3 new characters: Eren, Mikasa, and Levi
• 2 new skins: Roy and Anna (Scout Regiment)
• Exclusive ODM gear
• New NPCs and enemy Titans from Attack on Titan
• An Attack on Titan–inspired storyline, gameplay and UI themes, mini-games, new skills, reward icons, and IAP bundles

Key results

Revenue and ARPDAU Momentum. According to AppMagic monthly Idle Slayer revenue increased 88% after the collaboration launched, with ARPDAU up 59%. The U.S. drove the largest share of this uplift, followed by Germany and the U.K.

DAU and Retention Surge. During the event period, monthly downloads increased 70%, with peak DAU surging 36%. Monthly new users rose by a notable 72%.

Strong Community Reception. The Attack on Titan collaboration exceeded player expectations and received an exceptionally warm response, achieving unprecedented success since the game’s debut. Both veteran and new players praised the seamless integration, collaborative storyline, and innovative mechanics. Overall engagement across Idle Slayer’s social media channels increased 188% during the event.

Yodo1 Role

To meet fan expectations and deliver a high-impact Attack on Titan experience inside Idle Slayer, our IP Licensing team:

• Guided Pablo Leban through the supervision and approval process, ensuring everything followed the IP holder’s requirements.
• Bridged communication gaps — in both creative alignment and language — to keep feedback cycles clear and efficient.
• Aligned all creative elements (characters, UI, story, assets) with official brand guidelines while preserving Idle Slayer’s unique style.
• Managed timelines and approvals to keep the collaboration on schedule without sacrificing quality.
• Supported negotiations for the use of Attack on Titan voice-over (VO) lines and music.

About Yodo1

Yodo1 helps mobile game developers grow globally through licensing, monetization, IP partnerships, and publishing. Yodo1 Licensing builds lasting IP collaborations between mobile games and media brands, helping both sides create crossover strategies that boost loyalty, attract new players, and stand out in a competitive market. Learn more at yodo1.com.