Nakakapagpabagabag

Dasu wrote, composed, and produced Nakakapagpabagabag as a VOCALOID original using Kagamine Len's voice. By the author's own description, the lyrics frame a kind of modern Noah's Ark: rather than mourning those who ignored the warnings, the narrator sadistically mocks their stubbornness. The track opens Dasu's Stella Paradigm song series (though it was not the artist's first VOCALOID upload, which was ENEMY), and the red-haired boy in the video belongs to Dasu's creative universe known as shio. It is sung in Tagalog, the language of the Philippines, a rare choice in the VOCALOID scene.

The song arrived with PRIME 2's 1.10 update in November 2017 as the game's first Tagalog-language track. The arcade cut was trimmed by roughly a minute from the original, and the Korean edition rendered the title as 'worrisome' rather than transliterating it. Running at 145 BPM, in PHOENIX it carries Single charts (S11, S15, S19), Double charts (D16, D20), and a two-player Co-Op.

The S19 is the headline chart: even the 1.10 teaser made an impression with its heavy freeze usage, which begins immediately and later overlaps with awkward triple notes. Early on many called it underrated, but over time the consensus settled on it being hard only on the first read, since its freezes are regular and don't require the memorization that other gimmicks demand. It rose from 18 (in PRIME 2) to 19 in XX, and clearing it at SSS rank or above grants the GIMMICK Lv.7 title; its charter, EXC, achieved an all-perfect with the NS option. The S15 strips the freezes from the S19 and works well as practice for its patterns. In Double, the D20 spreads the S19 idea across both pads with more tangled patterns (Jboy likened it to solving a puzzle) and went from 19 to 20 in XX, while the D16 is a Half-Double centered on hold notes. The Co-Op keeps the signature freeze effect.

In 2024 the song returned to the spotlight when it was added to the global server of Project SEKAI, where it was likewise a Tagalog pioneer. In an interview around that time Dasu explained that only Kagamine Len's Japanese library was available, so the vocals were programmed in Japanese; luckily Tagalog and Japanese pronunciation are close enough that this caused no major trouble. Because of its eccentric genre, the song remains divisive among players.