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The story revolves around Tsukasa, a girl deeply obsessed with her brother. She meticulously documents every detail of her "onii-chan experiment" in her blog.
She explores her feelings and experiences, chronicling each moment she spends with her beloved "onii-chan".
Through her writings, readers gain insight into the intricate bond between siblings, as seen through Tsukasa's eyes.
Her blog becomes a window into her world, revealing the extent of her devotion and the lengths she goes to understand her brother better.
Each entry provides a glimpse into her thoughts and emotions, showcasing the depth of her obsession.