Episode 1 (Algebra Project S2)

The Deep Secret is the first episode of Algebra Project S2. It's about Natural Numeral's warning about her secret to Math-chan.

Summary
''The warning of Natural Numeral's secret is here due to her revealed type of secret to Math-chan or Yume. Will she not be warned to her deep secret?''

Trivia

 * The secret of Natural Numeral of this episode is a reference just like in episode 5 of Algebra Project S1.