クラス
くらす
kurasu
= class / classroom / grade level
クラス (kurasu) is an English loanword that has become completely natural in Japanese — the word for a school class or classroom group that every Japanese student uses daily from elementary school through university.
Kurasu comes from the English word ‘class’ and refers to a homeroom class in school — the fixed group of students assigned together for a school year. In Japanese schools, students typically stay with the same kurasu for all subjects (except electives), so the kurasu becomes a tight social unit. Kurasu also refers to the classroom itself and, in broader use, to a class level or category (such as ファーストクラス, faasuto kurasu — first class in an airplane). At university, it can also mean a single course or lecture class.
Don’t confuse kurasu (クラス, school class/group) with jugyou (授業, a specific lesson or period). A kurasu is the fixed group of students; jugyou is the individual class session. ‘クラス替え’ (kurasu-gae) is the annual reassignment of students into new class groups — a socially significant event in Japanese school life.
Everyday use
今年は隣のクラスに仲のいい友達がいる。
Kotoshi wa tonari no kurasu ni naka no ii tomodachi ga iru.
This year my close friend is in the class next to mine.
Casual / Social Media
クラス替えでまた別れちゃった…寂しい
Kurasu-gae de mata wakarechatta… sabishii
We got separated again with the new class assignments… so lonely
Formal / Cultural context
日本の学校制度では、クラスは単なる学習単位を超えた社会的コミュニティとして機能している。
Nihon no gakkou seido de wa, kurasu wa tan-naru gakushuu tan-i wo koeta shakaiteki komyuniti toshite kinou shite iru.
In the Japanese school system, the class functions as a social community that extends beyond being just a unit of learning.
The concept of the homeroom class (クラス) is central to Japanese school culture in a way that differs from many Western systems. Japanese students spend almost the entire school day with the same classmates in the same room — teachers rotate to the class, not the other way around. This means the kurasu becomes a tight social unit that shapes friendships, social hierarchies, and daily life for an entire year.
At the end of each school year, クラス替え (class reassignment) is a significant social event. Students are reshuffled into new class groups, separating some friendships and creating new social opportunities. Manga and anime frequently use クラス替え as a narrative device — a chance meeting in a new class, the anxiety of being separated from friends, or the opportunity to start fresh with a new social identity.
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