Shiro Neko

1) Shiro Neko (The Cat Shiro)
Sensei is a veterinarian who works hard and always sleep in the last train. One day, a boy wake him up and all that he thinks is "Kind childen really do exist"... But is that little kid really kind? Or is he like a stray cat?

2) Sweet Days
Asai and Yoh were childhood friends, but Asai had to move out, so he leaves a lesson to Yoh: "You should get stronger". Years later, Asai is a new student and, whoa, Yoh studies there too, but... He became a deliquent?!

3) And Sheep
"It's impossible to talk to animals", that what Lin said when he was visiting Kuranosuke, a genius that knows everything about quantum physics, fundamental chemistry and medicin...