We're Still in the Spring of Life.

Issei Saegusa is a young man who met Tooru Arochi, a brusque transfer student, during his senior year of high school. After a series of twists and turns, the two are accepted into the same university. The morning of the entrance ceremony arrives with great anticipation. Although Issei wants to spend more time with Tooru, he doesn't want to neglect his studies, either, because he is studying aerospace engineering. Tooru, on the other hand, wants to improve his social skills in university. Then, he meets someone new right away...?

(Source: Media Soft, translated)

Note: Includes one extra chapter.