Ruri no Houseki Episode 4

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Alternative Titles

Synonyms: Introduction to Mineralogy

Japanese: 瑠璃の宝石

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Information

Type: TV

Episodes: 13

Status: Finished Airing

Aired: Jul 6, 2025 to Sep 28, 2025

Premiered: Summer 2025

Broadcast: Sundays at 21:30 (JST)

Producers: Aniplex, Movic, AT-X, Tokyo MX, BS11, Egg Firm, FuRyu, Kadokawa, Bit grooove promotion

Licensors: None found, add some

Studios: Studio Bind

Source: Manga

Genre: Slice of Life

Themes: CGDCT, Educational

Demographic: Seinen

Duration: 23 min. per ep.

Rating: PG-13 - Teens 13 or older

Statistics

Score: 7.99¹ (scored by 26,186 users)

¹ indicates a weighted score.

Ranked: #725²

² based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.

Popularity: #2700

Members: 80,285

Favorites: 393

Available At

Official Site

@rurinohouseki

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Aniplus Asia

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#4 - Study of Sands

Suna wo Himotoku (砂を繙く)

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Duration: 00:23:40
Aired: Jul 27, 2025(JST)

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Synopsis

Seeking sapphires, Ruri searches sands. Nagi explains that river sand recaps the geology of all upstream drainages. Examining sand from each tributary and recording both positive and negative results will eventually lead to the source of the sapphires. But the method requires hours of work on the binocular microscope. Ruri finds a shortcut by running a magnet over the sample to remove the magnetic fraction. Yoko works on her fluorites, which may contain tungsten. Ruri's friends begin to wonder how she's spending her free time.

(Source: Wikipedia)

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