Zange

1) A Confession of His Own Guilt
Story of a high-school student who was sexually assaulted when young, and grew up to be openly homosexual. He always tries to antagonise a teacher whom he doesn't see eye to eye...

2) Risky
A university student moves into his brother's apartment in the city but has yet to see his sibling, but the brother's friend just wouldn't stop hanging around.

3) Kimi Sae Oreba...
This story is the beginning to one of her book Kimi Sae Ireba... (chapter 1-3). A man marries his supervisor's daughter and she passes away soon after. The supervisor tries to get him to remarry.

4) Kyoushi B
A teacher chances upon a teacher-student relationship.

(Source: MU)