Sweet Guardian

Kasuga Yuuki had always been in love with Himuro Makoto. One day she decided to confess to him and ended up rejected. On the same day she fell asleep on a supplementary class and ended up staying late at school. To her happiness, she found out that Himuro-kun was also still at school, but somehow he had a gun?! Moreover he tried to kill their school Chairman and admitted he is a hitman?! And later she ended up going out with him!? Is this all a dream?! Source: MU Extra chapter from Ojousama Gomeirei wo.