One-shot compilation of Shimamoto's earlier works for Shogakukan:

Blazing Transfer Student - Kaiju Battle! (炎の転校生・怪獣戦闘!, Honoo no Tenkousei - Kaijuu Sentou!): Noboru Takizawa and crew are back for another chaotic event, this time dealing with an alien invasion. A bonus story done half a year after serialization finished.

Warrior of the Sun Wind Breaker X (太陽の戦士ウインドブレーカーX, Taiyou no Senshi Wind Breaker X): In a school without a dress code, leagues of students fight to force others to wear what they want. One young man stands up to protect the girl he loves from being forced to wear anything but her beloved uniform.

Hardly a Hero (ほとんどヒーロー, Hotondo Hero): A short serial of 5 chapters, about a seemingly good-for-nothing boy with a penchant for sleeping finding himself part of his school's baseball team.
-- Chapter 1: A Full-Powered Morning Sprint: Shingaku High School's baseball club is in a dire state. Should it lose again, the club will disband. Sakata, the captain, sees promise in Nemuri, a boy who comes very late to school like him and has a tendency to doze off...
-- Chapter 2: A Hero of Hope: Nemuri is now part of the baseball team, and plays with the others in their next match. However, he doesn't play quite as the others expect him to.
-- Chapter 3: Revival of the Great Hero: Nemuri finds frustration with his habits and how they undermine his team. Luckily, another opening's been made for the team, but the conditions are severe...
-- Chapter 4: The Sleeper in the Ballpark: The baseball team has no choice but to give a good, crowd-pleasing game, or else they'll disband for good. Is Nemuri up to the task?
-- Chapter 5: A Sleepless Victory: Nemuri and crew wrap up the game. But is that all?

My Love Qualifications Are Nothing! (恋の資格がナッシング, Koi no Shikaku ga Nothing): Shimamoto's sole shojo work, serialized in Ciao. An absurd romantic gag comedy about the rather careless and troublesome Misato and her questionable attempts at getting the attention of Moriguchi, the boy she longs for.