One Warm Spring

Kasuga enters high school with one goal in mind -- to get himself a girlfriend! His plans do get pushed back due to a minor car accident, but no worries...! The day he returns to school, he catches sight of Morikawa, a first-year, and it's love at first sight. Learning that she prefers the calm and stoic type, he takes drastic measures and forces a "cool guy" act. To his surprise, things seem to work in his favor. That is, until...

(Source: MangaPlaza)