Getsuyoubi no Tawawa

読めばアナタも元気になれる！ 月曜日の憂鬱なんて吹っ飛ばす！ たわわな女の子たちの日常コメディ！

A salary man is quite depressed, especially on Mondays. At his lowest point a well-endowed High-School girl calling herself Ai-chan stumbles breast-first into his face. The concussion she gave him served as the start of their relationship.