Japan's television anime landscape continues to be shaped by established franchises, according to household ratings data from the Kanto region for June 8-14.

Sazae-san maintained its grip on the top spot with a 7.7% average household rating on Fuji TV, followed by Detective Conan at 6.1% on NTV. These long-running shows have built audiences over decades, making them consistent fixtures in the ratings.

Classic family-friendly series rounded out the top tier: Chibi Maruko-chan pulled 4.8% on Fuji TV, while Doraemon drew 3.1% on TV Asahi. Both air in prime weekend time slots designed to capture multigenerational viewers.

Among currently airing series, That Time I Got Reincarnated as a Slime season 3 performed strongest, hitting 2.8% on NTV's late Friday slot. Ascendance of a Bookworm Part 3: Adopted Daughter of an Archduke followed at 2.2%, also on NTV. One Piece maintained its presence at 2.2% despite airing at 11:15 PM on Sunday nights.

More recent releases like Star Detective Precure! and Demon Slayer's rebroadcast episodes charted lower in the 1.9% to 2.0% range, competing with children's programming slots. Even Bluey, the popular children's import on NHK-E, landed at 1.4%.

These figures reflect a familiar pattern in Japanese broadcasting: established brands with decades of viewer loyalty consistently outperform newer entries, regardless of critical acclaim or fan engagement on streaming platforms. Time slot placement also plays a significant role—primetime Sunday slots favor family-oriented series with broad appeal, while newer anime targeted at older demographics compete in late-night slots where fewer households have television on.

It's worth noting that these ratings measure live television viewership only and don't account for time-shifted recording or streaming consumption, which has grown substantially as viewing habits change. The data comes from Video Research's survey of households in Japan's Kanto region.