01① Chemistry of Opposite Step-Siblings
Serious and logical stepbrother Kota, and the super-gal free-spirited stepsister Aika.
A crappy sibling pair with the worst relationship where insults fly whenever they meet.
The exchanges between these complete opposites are just hilarious 🔥
02② Beautiful Full-Color Art
The original manga is a full-color work by Jinba Yaki-sensei.
Character expressions and emotions are delicately expressed, making it visually enjoyable.
That beauty is planned to be reproduced in the anime ✨
05⑤ A Heroine Who Also Cares About Her Parents
Aika looks frivolous at first glance, but she actually has a caring side toward her parents.
The gap moe of her acting like a "good girl" in front of parents is appealing.
She becomes more and more charming as her past and inner self are revealed 💖
06⑥ Growth of the Caring Stepbrother
Aika gradually becomes attracted to Kota's caring nature despite everything.
The process of her view changing toward the stepbrother she initially looked down on is a highlight.
Pay attention to the changes in their relationship 👀
07① Relationship Changes Due to an Incident
Kota rescues Aika when she's about to be attacked by a guy.
This incident triggers a change in Aika's attitude toward Kota.
Pay attention to developments where she starts wanting hugs and more 💓
08② The Forbidden Line Between Step-Siblings
Their relationship gradually escalates.
The point is how long they can maintain the line "because we're step-siblings."
Kota's figure wavering between reason and instinct is a highlight 🔥
09③ The Thrill of Whether Parents Will Find Out
The step-sibling relationship must never be known to their parents.
There are nail-biting developments when parents return home.
Thrilling developments continue about whether they can hide their secret relationship 😱
10④ Aika's Past Trauma
Aika's intense playing around with guys is related to past trauma.
Kota supporting and being there for that trauma is moving.
Look forward to important episodes where their bond deepens 💫
11[Beginning] Becoming Step-Siblings from Father's Remarriage
Father Yoshiyuki's remarriage is decided, and Kota meets new mother Misaki and stepsister Aika.
Kota thinks "she seems dumb" at Aika's first words "Nice to meetcha♪"
His first impression of her being pretty collapses instantly—the worst first meeting 💢
12[Cohabitation Starts] Hell's New Life Begins
While parents are away, free-spirited Aika brings guys home and does whatever she wants.
Kota is fed up with the sounds of Aika's messing around from the next room.
The worst days begin where insults never stop whenever they meet 😤
13[Turning Point] Triggered by an Incident
Kota rescues Aika when she's about to be attacked by a classmate.
This incident changes how Aika sees Kota.
Aika gradually starts being attracted to her stepbrother who's caring despite everything 💕
14[Progress] Toward a Forbidden Relationship
Kota starts receiving bold approaches from Aika.
Asked for hugs and more physical contact, he responds despite his confusion.
While conscious of the line of being step-siblings, their relationship deepens 🔥
15📺 TV Broadcast
TOKYO MX
From January 2026, every Sunday at 25:00~
BS11
From January 2026, every Sunday at 25:00~
※Standard broadcast time for Monk Slot
16📱 Streaming
AnimeFesta
Every Sunday at 24:00~ Fastest streaming
• On-air version (free)
• Premium version (exclusive streaming)
YouTube
Every Sunday at 25:00~ (YouTube version)
※Premium version is AnimeFesta exclusive
17🎬 Broadcast Format
On-air Version
Same content as TV broadcast
Some scenes self-regulated
Premium Version (Uncut ver.)
AnimeFesta exclusive streaming
Complete version with regulations removed 🔞
18🍓 Takamura Aika
CV: Yurimoto Hana
The girl who became Kota's stepsister.
Has a very aggressive dating life, but also has a caring side toward parents.
Completely looked down on Kota, but her approach changes due to an incident.
A super sassy modern-day gal with blunt bangs as her trademark 💖
[Trivia] Aika's name "藍花" is a pun on "Ichigo Aika (Strawberry Elegy)"!
19👓 Takamura Kota
CV: Igarashi Yuta
A young man who became Aika's stepbrother from his father's remarriage.
Has a logical personality and didn't get along with gal-like Aika, arguing from their first meeting.
After various events, he becomes attracted to her.
A virgin with a serious personality, but surprisingly good at cooking 🍳
[Trivia] Aika admits Kota's cooking is better than stepmother Misaki's!
20👨 Takamura Yoshiyuki
CV: Momosuke
Kota's dad.
Lost his wife and continued living with just Kota, but met Misaki and decided to remarry.
The four of them, including her daughter Aika, start living under one roof.
Has a gentle and calm personality 😊
[Trivia] Completely unaware of the children's forbidden relationship!
