Ova — School Days

It focuses on fan service and character interactions that wouldn't have been possible in the main series due to its tragic trajectory. 2. Magical Heart Kokoro-chan

The School Days anime features two primary episodes that shift away from the dark tone of the main series: 1. Valentine Days School Days OVA

The girls of the class compete to give chocolates to the protagonist, Makoto, in various romantic (and sometimes absurd) scenarios. It focuses on fan service and character interactions