No, the April bonus is paid based on the previous year's performance and evaluation, so you will receive the bonus as a non manager.
Specifically, it is calculated by applying the previous year's company performance, the bonus calculation basis from your time as a non manager (base salary including adjustment pay), and your individual performance evaluation coefficient for your grade.
For details on the bonus calculation method and payment timing, please refer to the materials posted on People Connect (For manager here, Sogoushoku/Seisan-Gijutsushoku/Tokuteishoku here,) and the “Bonus Explanation & FAQ”.