一撃殺虫!!ホイホイさんLEGACY (Ichigeki sacchu!! HoiHoi-San LEGACY) was a manga first serialized on the monthly magazine Dengeki Black Maoh, a special edition of Dengeki Maoh. It’s a direct sequel taking place after the events of the original, it follows a new protagonist and adds new characters to the existing cast of usual looneys.
The protagonis, Mayu Domeki, a 14 years old highschooler that lives with her dad, is gifted a HoiHoi-San doll for her birthday. But the fact that her household struggles financially sours her on the idea of spending on something so unnecessary, so she acts unimpressed by it.
Of course, with the help of the supporting cast of unimportant highschoolers, she ends up warming up to HoiHoi-San in the end.
Mayu
And, as for the interceptor dolls we already know, they get upgrades in the form of, smaller, assistant accesories robots. A fad that helps boost their popularity even more (who doesn’t love baby versions of existing characters huh?).
HoiHoi-San Mini
Combat-San Rookie
Kage
On the business side of things, a new, competing brand appears. Kinryu seeks to dethrone HoiHoi-San, and so, partners-up with the manufacturer LIONESS to create a new line of dolls. Not interceptor dolls, but ‘variable dolls’.
Val-tan, the first variable doll
Usa-gear, the main doll from the DEAR GEAR line
Kuma and Inu, also in the DEAR GEAR line
This is the stage in which all the usual shenanigans expected of the story take place.
For a period of time, a tankobon release with a bonus DVD had been planned for March of 2013, which would compile all of the at-the-time released chapters. But, due to a “lack of prospects for it’s release”, it was cancelled even with the OVA out of production. The manga has never been officially published outside of the original releases on DBM and DM, except for an upload of the first chapters on the official Dengeki Maoh website.
The official printed run spans from September 2007 to March 2018, after which it would enter a hiatus of indefenitive length.
The Author, Kunihiko Tanaka, has published “revised” versions of some of the chapters on Twitter and Fanbox, which include updated art and minor story changes. As it stands, they are the only official way to read the manga, and the author has stated that some chapters have been lost entirely and won’t be re-published.
The only part of the OVA that is publicly avalible is a trailer that has been uploaded to YouTube. But there has been a screening during the Dengeki Anime Festival of December 2012 that showed it in full, promoting the yet-to-be-cancelled tankobon, along with a talk-show with the voice actors.