Qualia under the snow

"Kobayashi Akio and Oohashi Umi live in the same dorm and attend the same university. Akio prefers the company of plants and isn't particularly fond of people, while Umi's relationships with men never seem to progress past one-night stands. Umi quickly warms up to Akio, and despite their differences, Akio slowly opens up to Umi. But one day, Umi says to Akio, 'you're a nice guy, Senpai. I didn't even have to let you sleep with me for you to stick...