From Yesterday Manga Summary
Collection of vignettes drawn over a period of several years, some of which belong together, some of which are oneshots:
1) ch1-3, 9 -- Say You Love Me- AKANE Ryuuichi loves professor HASUMI Akira's artwork, that's why he became his assistant. But he also love Professor Hasumi.
2) ch4 -- That's a Blue and Transparent Surprise (oneshot)- Hikari's body produces electricity, so he can't touch anything metal. His childhood friend, Ten, is always taking care of him.
3) ch5, 8 -- Welcome to the Clinic Room- Asashi Keiichi is a middle school doctor. Ichikawa Yuu is his cute and innocent student who has designs on his sensei. Chapter 8 takes place 10 years later when Ichikawa is all grown up.
4) ch6 -- Home (oneshot)- Touri's lover Seiji has been living with him for two years, but sometimes he just takes off for a month at a time.
5) ch7 -- Listen to the Sound of Rain (oneshot)- One rainy day, bookstore owner Yamamoto Fuku shares his umbrella with beautiful high school student Toya Kairi.