This work depicts an incestuous relationship between a college-going brother and his high school sister Hina, presented in a bright and lively atmosphere, enjoyable as a story of a tsundere sister's growth. Hina-chan initially resists but soon proactively seeks kisses and fellatio from her brother, portraying an intimate relationship naturally. The morning fellatio scene under the table is particularly intense, with close-up facial shots and breast play enhancing the eroticism, and the line "I'm coming? Give it to me! Inside me!" is thrilling. Visually, she appears slightly mature for a sister role, but this adds charm for potential roles like a seductress or teacher. However, the title's "training" phrasing feels awkward, and the content remains ordinary incest fare. The lack of uniform play is disappointing, but overall, it's adorable, and I highly anticipate future works. Hina-chan, take care of your health and keep going strong.