Natsu no Zenjitsu

The only thing in Tetsuo's mind is art. The beauty, the nature, and the quality of art. One woman watches him handle his art. Her name is Akira. She watches as he constantly tries to draw day after day, and she oversees the completion of his work at a local art exhibition. Akira apparently has become interested in Tetsuo's love for art and his work. One rainy night, Tetsuo notices that Akira left her umbrella and he decides to deliver it to her. He finds her and gives her the umbrella and doesn't use it as he claims that the umbrella isn't his. As Tetsuo leaves, Akira tells him to wait. He turns around and finds Akira bringing her lips towards his... Love has bloomed in the middle of a rainy night.

(Source: MangaHelpers)