With the arrival of the fall 2025 anime season, harem genre fans have much to be excited about thanks to a thrilling array of new series. Among the most awaited titles are My Friend’s Little Sister Has It In for Me! and Chitose Is in the Ramune Bottle, both of which offer a delightful mix of romance, humor, and endearing character interactions that harem lovers cherish. Whether you prefer touching scenes or playful shenanigans, these upcoming shows are poised to provide captivating narratives that will keep audiences engaged all season long.

Isekai Munchkin: HP 1 no Mama de Saikyou Saisoku Dungeon Kouryaku tells the story of 16-year-old Yukito Kirihara, who has a deep affection for his 14-year-old sister, Sana. When an ogre appears outside their window in search of Sana, Yukito courageously steps in to help but ends up losing his life in the process. A mysterious woman offers him a chance at reincarnation, providing him with a character sheet in a magical book, only to find out that Sana is also trapped inside it. With a strong resolve to rescue her, Yukito sets off on a dangerous quest through a dungeon, facing the challenge of having just 1 HP, which turns every action into a critical gamble. The series is made up of 12 episodes, each lasting around 24 minutes. You can catch Isekai Munchkin on streaming services like Crunchyroll, Funimation, and others.

My Status as an Assassin Obviously Exceeds the Hero’s Follows Akira, whose existence takes a dramatic turn when he and his classmates find themselves in a different world, each gaining extraordinary abilities. While one of his fellow students takes on the role of Hero, Akira learns that he has been designated as the Assassin, a role that turns out to be surprisingly powerful. As he explores this unfamiliar setting, he reveals dark schemes involving the king and uses his talents to safeguard his classmates and uncover the truth. The series consists of 12 episodes, each lasting around 23 to 25 minutes. Viewers can watch the anime on platforms like Crunchyroll and Funimation when it premieres.

Sentenced to Be a Hero: The Prison Records of Penal Hero Unit 9004 is a dark fantasy anime set in a bleak world where the most dangerous criminals are forced to serve in the military as “Heroes.” These individuals are assigned the task of battling the armies of the Demon Lords, and if they fall in combat, they are resurrected to continue the fight. The story follows Xylo Forbartz, a disgraced former leader of the Holy Knights, who commands a unit of outcasts on the front lines. During this brutal war, Xylo encounters Teoritta, a powerful weapon disguised as a human, and they form a pact to ensure their survival and seek vengeance against those who betrayed him. The series is expected to have 13 episodes, each lasting around 23 minutes, and will be available for streaming on Crunchyroll and other platforms.

Let This Grieving Soul Retire! Season 2 is scheduled to premiere in October 2025, continuing the journey of Krai Andrey and his companions as they navigate the challenges of treasure hunting during its golden age. This follow-up will adapt the fourth volume of Tsukikage’s light novel series, showcasing Krai’s reluctant position as a leader and his ongoing desire to step back, even as his friends and party members raise their expectations of him. The anime is anticipated to consist of 13 episodes, each approximately 23 minutes long, following the same format as the first season. Fans will have the opportunity to stream the series on Crunchyroll and other platforms like Prime Video and Anime Times Amazon Channel upon its release.

Chitose Is in the Ramune Bottle narrates the whimsical story of Chitose, a high school student who inadvertently becomes trapped inside a Ramune bottle due to a mishap during a science experiment. As she adapts to her confined existence, she discovers that she can still communicate with her friends outside the bottle. The series blends humor and slice-of-life themes as Chitose navigates her unusual predicament while maintaining her friendships. This anime is set to have 12 episodes, each approximately 24 minutes long, and will be available for streaming on Crunchyroll starting in 2025.

My Friend’s Little Sister Has It In for Me! is an entertaining romantic comedy series that follows Akiteru Ōboshi, an ordinary high school student who is close friends with Ozuma Kohinata. Things take a turn for Akiteru when his uncle, a CEO of a media company, requests him to pretend to be his daughter Mashiro’s boyfriend. In exchange, he will receive backing for his game development team, the 5th Floor Alliance. Additionally, Iroha, Ozuma’s younger sister, can’t resist teasing Akiteru, despite being a kind and diligent honor student. As Akiteru navigates this fake relationship and pursues his aspirations in game development, he must also decipher Iroha’s changing feelings towards him. You can watch the anime adaptation on platforms such as Crunchyroll or HIDIVE, featuring 12 episodes, each approximately 23 minutes long.

Related – All 2025 Harem Anime of Spring 2025 (Airing Now)