Pi-chan (character)

Pi-chan, the minor character of the series, has been transferred to Subject-tan, to became the one of the subjects.

Her favorite friend, Natural Integer, is the main character since former websites release, but Pi-chan is the one who is featured in each portal.

She appears in episode 23, which is she is unidentified to her former appearance, similar to Extradecima, the former character in Cebu.

She is derived from the letter pi, the mathematical constant, which is leading 3.14 on two decimal places. That is her favorite decimal number, but she can memorize, and didn't complicate.