Hatsukoi no Tsuzuki wa Danshiryou de

Hatsukoi no Tsuzuki wa Danshiryou de summary:

Shu finds herself transferring to a high school filled with guys despite being bad at dealing with them, and decides to work hard to overcome her problem. But when she hits her limit, the one who saves her from this mindset is a remarkably flashy and cool guy named Shiba, who was initially nothing but cold and rude to her. In reality, Shiba is actually a kind person who tells Shu, “I will protect you.” Somehow, despite their differences, Shiba reminds Shu of her first love.