The Cul-de-sac in the Old City Centre

A boy gets into a relationship with his deceased older sister's lover. *Note: Includes the one-shots "Warui Seito (悪い生徒, Bad Student)" and "Taneda-kun to Tsukiaitai (種田くんと付き合いたい, I Want to Go Out With Taneda-kun)", and one extra chapter.*