One day, Nanami saw her classmates hitting a white snake. Nanami saved it and released it outside. When Nanami came back, Tomoe found a mark on one of her arms. Tomoe told Nanami that the mark means engagement between her and that snake. In order to protect Nanami, Tomoe went to school with her after that day. 
  Tomoe was sleeping and then Nanami went outside alone that afternoon in Kamisama Hajimemashita Episode 4. The white snake named Mizuki came back school and took away Nanami. Tomoe woke suddenly with a start and he rushed out of the classroom soon to look for Nanami but only found Nanami’s notebook on the ground. Tomoe tried his best to look for Nanami but he failed. However, Tomoe did not give up and he saved Nanami at last.

 

Renji and Soichirou had ever been good friends, but they were sweet on the same girl named Kisou. In order not to break up their friendship, they appointed that neither of them could say “love” to Kisou until they found another “Kisou”. One day, Kisou was dead, and Renji was told that Kisou was killed to protect Soichirou. And he was also told that the killer gave a large sum of money to Soichirou to hide the truth. Soichirou took the money and said nothing after Kisou’s death. 
  In fact, that is really not the truth. We are told almost everything in Kami-sama no Memo-chou Episode 7. Kisou was a boss’ lover. The boss’ wife knew it and she killed Kisou angrily. Soichirou was there too and he was hurt to stop the boss’ wife. Soichirou tried his best to protect Kisou but he failed.