Sutemi no Koubousen

Mamoru, a young self-defense officer, has always been in love with his senior, Akutagawa, who helped him when he was in high school. Mamoru, who was assigned to the same base as Akutagawa, is in charge of his long-awaited flight. Mamoru, who regretted not being able to reveal his love in high school, expressed his love for Akutagawa straightforwardly, saying, "I'm a proper adult now, so wake up!" Still, Mamoru keeps on attacking without mercy, but...?

(Source: Harper Collins Japan, translated)