School Days focuses on the life of Makoto Ito, a first-year high school student living with his divorced and unseen mother in the fictional city of Haramihama. During his second term, he becomes infatuated with Kotonoha Katsura, a soft-spoken schoolmate who shares train rides with him to and from campus. When his homeroom seating plan is rearranged, he becomes acquaintances with Sekai Saionji, an upbeat girl who takes a special interest in his newfound crush, befriending the two and providing them the grounds to meet. In spite of her triumphant efforts however, Sekai becomes jealous of the new couple, having developed feelings for Makoto herself.
Shinichi Mikuriya's average life takes a turn for the weird when his dad drops a megaton bomb - he's engaged! To multiple women! And they aren't even human! Shinichi Mikuriya had an ordinary life with his two cute, cheeky little sisters and his borderline psychopath of a childhood friend. Then one day his absentee father called with news. His father had been up to some business and he’d needed a bargaining chip, so now Shinichi has a fiancée!