Hatsujoukei Drags
First read from page 50 till the end, then go back to the beginning. First part: a student in love with the son of a yakuza. 6 years later, the student drugs the yakuza and they slip together. They meet again after some more years. Second part: about a new transfer student that has an incredible memory. His room mate is the student council president who wants to sleep with him. Thanks to his memory he is asked to do a "mission"
Usagi To Ookami No Shinshi Kyoutei
Chapters 1 to 5: Business men Chapter 6: Sakura Ice Beauty: chemistry teacher in love with another teacher Chapter 7: yakuza Chapter 8: searcher that tries to create new gums that taste like roses
Ake Nure Goyou ni Furu Yuki wa