Level description

◆ Level 0 ◆
Starter level with approx.400 characters per book using a vocabulary of around 350 words and です and ます endings in the main. Printed from left to right for starting beginners instead of top to bottom. Look carefully at the pictures and illustrations and the story will become self evident.

Grammar
present form, past form, interrogative, ~たい, etc.
※ です and ます endings in the main.

◆ Level 1 ◆
Early beginner level or Level 5 of Japanese Language Proficiency Test(JLPT) with approx. 400 to 1,500 characters per book. Use the same 350-words vocabulary as Level 0 and です and ます endings. Same vocabulary and grammar as Level 0 in longer stories.

Grammar
present form, past form, interrogative, ~たい, etc.
※ です and ます endings.

◆ Level 2 ◆
Advanced beginner level or Level 4 of JLPT with approx. 1500 to 2500 characters. Adds 150 word vocabulary to Level 0 and 1. Grammar less controlled than Level 1.

Grammar
dictionary form, て-form, ない-form, nominal modification, ~と(conditional), ~から(cause), ~なる, ~のだ, etc.

◆ Level 3 ◆
Pre-intermediate level or Level 3 of JLPT with approx. 2500 to 5000 characters per book. Adds 300 word vocabulary to Level 2. Grammar less controlled than Level 2.

Grammar
potential form, imperative form, ~とき, ~たら・ば・なら, ~そう(appearance), ~よう(conjecture, metaphor), compund verb, etc.

◆ レベル4 ◆
Intermediate level or Levels 3 and 2 of JLPT with approx. 5000 to 10,000 characters. Grammar even less controlled than Level 3. Kanji have no reading printed next to them.

Grammar
causative form, causative passive form, ~そう(information), ~らしい, ~はず, ~もの, ~ようにする/なる, ~ことにする/なる, etc.