Haganai: I Don't Have Many Friends S02E01 - I Think Something is Wrong with My Youth
Summary:
Yozora and Rika manage to trick Sena into letting them style her hair into a heap, filling it with all sorts of oddities. The next day, Kodaka goes over to Sena's house to study for his exams, where he discovers her room is decorated with pictures of Yozora that she uses for 'grudge purposes'. Kodaka is asked by Pegasus to spend the night, where he expresses his worries that Sena might be getting bullied, to which Kodaka replies that he will protect her.
Haganai: I Don't Have Many Friends S2E1 Screenshot
As we rejoin the Neighbors, we find that, no, they still don't
have any friends. Sena decides to follow Yozora's lead with a
stylish new haircut! Kodaka doesn't get much studying done
during his visit to the Kashiwazaki manor, but he does manage to
learn some disturbing facts about Sena