華夏楼/ Kagerou

Taisho era, year 12. The Great Kanto Earthquake causes a great disaster. Main character loses his family and house acquiring huge parents debt at the same time. An unknown person starts to send him money every month. Finally, a year later the mysterious benefactor sends a letter inviting protagonist to come to the western mansion in the mountains. It turns out that his help is needed in the ugly and fierce battle over inheritance.