Fridge / Majisuka Gakuen

• Although all the protagonists aim to reach the top and overthrow the Rappappa leader, none of them actually manage to do that, so we never really know how each Rappappa president compares to each other in strength (except for Salt, who defeated Sakura). It is said that Nezumi and Center took the top of Majijo between seasons 2 and 4, but we never see what happened, although Otabe certainly witnessed everything and it was implied that Maeda's parting words in season 2 meant she was giving the top position to them.
• In Cabasuka, it's never explained how Sakura acquired the lot where they built the Aquarium, why she already has the plans when Principal Mori just broke the news that Majijo is going bankrupt, and how she and Saionji obtained the starting capital. A commercial space located near the highly popular Ike Ike Tattoo must have cost a fortune by itself.