Toshiue no Hito

The woman Tsutomu encounters in college was older and smaller than he is, and for some reason, looks like the same girl in his dreams. The heart-pounding love affair between him and the "older woman" begins.

(Source: Animewaves)

Includes 2 bonus story: Ageha-chan's Lost Child (vol.3) and Stolen Breasts (vol.4).
Includes H na Manga ga Dekiru made (Hなまんがができるまで); Young Animal Arashi Vol.11