There's also a manga thats based on the
Goshuushou-sama Ninomiya-kun light novel. its being serialized in the shounen manga magazine
Dragon Age.
As of this post there are no volumes released of the manga.
Title of manga and other info:
ご愁傷さま二ノ宮くん
Goshuushou-sama Ninomiya-kun
Original Work: Suzuki Daisuke
Drawing: Suzuro Haiji & Hamada Reiji
Character Original Concept: Takanae Kyourin
Shounen manga.
Serialized in the shounen manga magazine Dragon Age.