1-4. Furue Tsumore Shiawase no Hana
Yuuri has always been attached to his childhood friend and neighborhood Onii-san; Aki. With a certain fondness for his friend, he enrolls in the same college where Aki is working as a lecturer. Yuuri immediately falls into the position of Aki's personal caretaker and not before long, he comes to realize that there is more to their relationship than he understands. Furue Tsumore Shiawase no Hana is a story of the delicate balance between friendship and love. (Source: Blissful Sin)
5, 8. The Trembling Flower of Happiness
Aki and Yuuri is trying to come to terms with their relationship and where to draw their lines.
Continuation of chapter 5 of Koi no Shizuku.