Manga Watari-kun no ×× ga Houkai Sunzen

The life of Watari Nao changed dramatically after the death of his parents, and now he spends all his time with his younger sister. He refuses to attend clubs, classes, etc. in order to spend time with his sister. Many begin to mock him, but the guy doesn't care as long as his sister is happy. However, the guy does not even know that the danger that almost destroyed their lives 6 years ago will return soon again. A mysterious girl with a hoe is about to return everything that belonged only to her!