Love 2 Quad – Episode 2

One day, Aoi-sensei - hands down the most popular teacher at Akakura Gakuen - approached Wataru and told him some unexpected news. She revealed herself as an agent for a secret international defense organization called Cradle, fighting against their sworn enemies, "4D". Their only hope to defeat these foes lies in engaging in ecchi activities with you, Wataru! This is how you'll gain the energy needed and ultimately use love's power to destroy your adversaries.

Joining forces alongside Aoi-sensei are her imouto-like childhood friend Honoka, classmate Ermalit, a stoic girl from future named Mirai, and an adorable chibi version of Chitose who hails from the past! But even with this dream team assembled, they're all at a loss as to what exactly needs doing.

So yeah, that was how your peaceful bachelor life came crashing down...