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Bokutachi wa Benkyou ga Dekinai (We Never Learn) Episode 9 (Subbed)
Ep 9: 禁断の地にて彼は, [X]が為奮闘する - He Struggles with X in a Forbidden Zone - Kindan no Tsuchi nite Kare wa, [X] ga Tame Funtou Suru
When Nariyuki is walking by Mafuyu`s apartment one day, she invites him in because she apparently had seen a cockroach. He goes inside and finds the place just as messy as it was during his last visit.