Taishou Mebius Line: Chicchai-san

Based on the boys-love game Taisho Mebius Line.
The game is set during Japan's Taisho era (1912-1926), and it centers on Kyouichirou Hiiragi, a boy who travels from his provincial town to Tokyo to attend university. He carries with him his family's sword to protect himself. When he arrives in Tokyo, he becomes swept up in a plot by the Imperial army.
(Source: Anime News Network)