Bishamonten-Sama No Itoshigo summary:

"...It's a little punishment."Izumi had adored the deity Bishamonten ever since he was a child. However, since the Kaguragi family is a family that had been used as sacrificial offerings for generations, due to Izumi's constitution making him susceptible to being targeted by demons, he left his hometown when his parents passed away. But he returned to enter university. When he was attacked there by a shadowy figure, the deity appears and-...? An interspecies love between a hottie Bishamonten-sama and a pure-hearted university student with the constitution of a sacrificial offering