Thus, the Sisters Trade Places
That girl is Mimika, Makina’s "younger sister" robot, who has stolen Makina’s body! According to Makina, Mimika is an elite agent who specializes in deception, tricking people by acting weak and helpless. With Mimika vanishing without a trace, Eita devises a special otaku-style strategy to track her down.
Aired 19/05/2025EP 7 - Thus, the Sisters Trade Places
Kakushite! Makina-san!
This risque romantic comedy story centers on Eita, an introvert mecha otaku high schooler who has a crush on the school's most popular girl Makina. When Eita finds Makina at her doorstep, he is flustered, and even more so when Makina reveals her secret: that she is a "sexaroid" robot designed for pleasure, and she is asking Eita to conduct some repairs on her discreetly. While Makina immediately tries to make a move on Eita physically, Eita struggles to contain himself, while also hiding her secret.
(Source: Anime News Network, edited)