‘My Friend’s Little Sister Has It In for Me!’ Unleashes Key Visual, Trailer, and October 4 Premiere with Theme Song Reveals

Get ready for a whirlwind of fake relationships, playful teasing, and burgeoning romance! The highly anticipated anime adaptation of My Friend's Little Sister Has It In for Me!, known colloquially as Imouza, has just dropped a dazzling new key visual and an electrifying main trailer. This exciting reveal ignites fan excitement ahead of its October 4, 2025 premiere. This adaptation brings to life Ghost Mikawa's acclaimed light novel series, originally published by SB Creative under the GA Bunko imprint, with illustrations by Tomari.

The Story Unfolds: A Web of Pretence and Passion

At the heart of Imouza is Akiteru Ōboshi, a high schooler whose primary ambition revolves around cultivating support for his nascent game development group. His world takes an unexpected turn when his uncle presents a lucrative, yet complicated, offer: act as the boyfriend of his cousin, Mashiro Tsukinomori, in exchange for crucial backing. This unconventional arrangement immediately sparks a dynamic tension with Iroha Kohinata, the younger sister of Akiteru's best friend. Despite her public persona as a diligent honor student, Iroha delights in relentlessly teasing Akiteru, adding a layer of comedic friction to their daily interactions.

Adding another dimension to her character, Iroha secretly harbors dreams of becoming a professional voice actress, contributing her talents to Akiteru's group projects discreetly due to her family's disapproval.

Behind the Scenes: Production and Talent

The production behind this promising series is spearheaded by Studio BLADE, with Kazuomi Koga, celebrated for his directorial work on Rent-a-Girlfriend, at the helm. Toko Machida is meticulously crafting the series composition, ensuring a faithful yet fresh narrative flow, while Katsuyuki Sato is lending his artistic prowess to character design, bringing Tomari's beloved illustrations to animated life.

Captivating Melodies: Theme Songs Revealed

Further fueling anticipation, details regarding the anime's captivating theme songs have also been unveiled. The energetic opening theme, Uzakawaikute Nani ga Warui!, features the distinct vocal talents of popular VTuber Akami Karubi, a unique collaboration that bridges the vibrant worlds of digital entertainment and anime. Complementing this, the poignant ending theme, Hoshi no Kodo, is beautifully performed by Kohana Lam. Viewers can mark their calendars for the grand premiere on October 4, 2025, with its Japanese broadcast effectively scheduled for 1:30 AM JST on October 5.

Promising a rich tapestry of comedic and romantic elements interwoven with a charming slice-of-life sensibility, My Friend's Little Sister Has It In for Me! delves into the intricate dynamics of teenage relationships, the complexities of a 'fake dating' premise, and the personal aspirations that drive its diverse cast within a lighthearted harem and ecchi framework. Both devoted followers of the original light novel and new audiences are eagerly encouraged to immerse themselves in this release, which guarantees a delightful mix of heartfelt moments and lively, teasing exchanges synonymous with the genre.