If you're looking for manga similar to 23.exe: Feel so good, you might like these titles.
Hachune Miku is the small and spirited spin-off character of the famous Hatsune Miku. Equally recognizable by her long pigtails and affiliation with leeks, Hachune Miku and her friends go on their own adventures.
This is the (imaginary) beginning story of the crazy popular Vocaloid Character GUMI!! By some freak incident, the now cyborg school girl has her eyes set on her idol debut as "Gumi" under the mysterious organization, "Intane Group"!?
The major power of the Evillious region, the Kingdom of Lucifenia. Ruling this vast country was the 14-year-old princess, Riliane. She used her absolute power to squeeze everything from the people, and anyone who defied her was beheaded without mercy.
Rin and Len are older sister and younger brother, siblings in a samurai family that rules in the land of Musashi. They lived there happily with their uncle, the current clan leader. Len has started to feel guilty about Rin's wooing. Then, one day, they fnd out that there have been talks with the land of Owari about Len taking part in a political marriage. Rin is against losing the man she loves, while Len accepts reality. The name of the girl who holds their fates in her hand is... Miku.