Hikari latches onto the reluctant and gloomy neighbor boy, Yuki. Later, when Masaki falls ill and needs to isolate himself, Hiromu and company try their best to distract Hikari from "Ma-cha's" absence.
It's just got a few side effects. 
I'll be better soon.
Solo son los efectos secundarios,
pronto pasarán.
Son efectos secundarios,
pero estaré bien enseguida.
Les effets secondaires
ne devraient pas durer.
Solo che ha qualche effetto collaterale. 
Presto starò meglio.
Это побочный эффект, скоро пройдёт.