Ana no Oku no Ii Tokoro

Episode 1 part 1 - Sunao ja Nakute mo...
The story of the mischief of 2 students, male and female.

Episode 1 part 2 - 2 part 2 - Gibo
The story of a teacher who became the stepmother of who her high school student was.

(Source: Nekopoi and Has Been Translated and Edited)