系統 – Used in

2. lineage; ancestry; family line

3. group (e.g. of colors) (colours); family (e.g. of languages); party; school (of thought)

4. close (evolutionary) relationship

5. a population sharing a common ancestor (in genetics); strain (e.g. bacterial)

	Used in	Used in %
Anime	86	(6%)
Live action	37	(2%)
Visual novels	161	(29%)
Novels	525	(31%)
Non-fiction	35	(24%)
Web novels	255	(24%)
Aozora Bunko	130	(22%)

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Meanings

Used in

The Irregular at Magic High School

Zero no Tsukaima

Mahou Sensou

Free Life Fantasy Online: Immortal Princess, Hajimemashita

Hell Mode: Yarikomizuki no Gamer wa Hai Settei no Isekai de Musou Suru

Ore no Petto wa Seijo-sama

Rental Magica

Tensei Shitara Slime Datta Ken

Seiken Gakuin no Makentsukai

Overlord

Wizard's Brain

Hagure Yuusha no Aesthetica

Saredo Tsumibito wa Ryuu to Odoru: Dances with the Dragons

Mushoku Tensei: Jobless Reincarnation

Hazurewaku no "Joutai Ijou Skill" de Saikyou ni Natta Ore ga Subete wo Juurin suru made

Seirei Gensouki

Bodacious Space Pirates

Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita

The Rising of the Shield Hero

Toaru Ossan no VRMMO Katsudouki

Sokushi Cheat ga Saikyou sugite, Isekai no Yatsura ga Maru de Aite ni Naranaindesu ga.

Tensei shitara Ken deshita

Zero no Tsukaima Gaiden: Tabatha no Bouken

9S (Nine S)

A Certain Magical Index

VRMMO Gakuen de Tanoshii Makaizou no Susume: Saijaku Job de Saikyou Damage Dashitemita

Nidome no Yuusha wa Fukushuu no Michi wo Warai Ayumu

Arifureta Shokugyou de Sekai Saikyou

Kumo Desu ga, Nanika?

Mizuzokusei no Mahoutsukai

Tutorial ga Hajimaru Mae ni: Boss Chara-tachi wo Hametsu sasenai Tame ni Ore ga Dekiru Ikutsuka no Koto

Ishura

Accel World

Guin Saga

Goju Kishidan Monogatari

Ore wa Subete wo "Parry" suru: Gyaku Kanchigai no Sekai Saikyou wa Boukensha ni Naritai

Zero Kara Hajimeru Mahou no Sho

Full Metal Panic!

Ellie Golden to Itazurana Tenkan Busu de Debu Demo Ikemen Elite

Rokujouma no Shinryakusha!?

Re:Zero − Starting Life in Another World

Sleeping Strega

Shitsuji na Shitsuji to Testament

Dogura Magura

RDG Red Data Girl

Eiyuu Kyoushitsu

Kenja no Deshi wo Nanoru Kenja

Uchi no Musume no Tame no Naraba, Ore wa Moshikashitara Maou mo Taoseru Kamoshirenai

Kekkyoku, Ninja to Dragon wa Docchi ga Tsuyoi no?

Saijaku Muhai no Bahamut