KOCCHI MUITE, AI

Suzuhara lives in a cheap apartment which has way to thin walls; whenever his neighbour Nishino brings home girls for the night, Suzuhara can hear all of it! At first it only annoys Suzuhara but when his long time crush, Nakayama, asks to borrow Suzuhara's a apartment so he can have sex with his new girlfriend, everything changes.

(Source: Fusion Product, translated)

Note: Includes the oneshot 'Hi Manual Renai'.