On average, one person dies by suicide every 40 seconds, recent data show. Yet, extant studies have largely focused on the risk factors for suicidal behaviors, not so much on the thought process and the interactions of factors leading up to a suicide attempt. To understand how suicide thoughts arise and persist inside one’s mind, and look for actionable solutions to reduce the risk of suicidal ideation in young adults, the most at-risk group of deaths by suicide. A multifiltering information mechanism called Mindsponge serves as the theoretical basis. Bayesian analysis with the Hamiltonian MCMC technique (Markov Chain Monte Carlo) was run on a dataset of multinational students (N = 268) in an international university in Japan. Item 9 in the PHQ-9 was used to survey suicidal ideation in students. The associations among four main variables, namely (i) suicidal ideation, (ii) help-seeking willingness (informal and formal sources), (iii) social connectedness, and (iv) being an international student, were tested in four models. Social connectedness is negatively associated with suicidal ideation (μ_(ToSC_Suicide) = -0.13 and σ_(ToSC_Suicide) = 0.02), but when the interaction with international students is added, the social connectedness’s effect on suicidal ideation becomes less impactful (μ_(ToSC*Inter_Dom_Suicide) = 0.01 and σ_(ToSC*Inter_Dom_Suicide) = 0.01). Social connectedness on help-seeking behavior among international students is also negative (μ_(ToSC*Inter_Dom_InformalHelp) = -0.01 and σ_(ToSC*Inter_Dom_InformalHelp) = 0.01). Meanwhile, informal help is negatively associated with suicide (μ_(InformalHelp_Suicide) = -0.51 and σ_(InformalHelp_Suicide) = 0.11) whereas formal help is positive (μ_(FormalHelp_Suicide) = 0.08 and σ_(FormalHelp_Suicide) = 0.10). The findings support our assumption on three fundamental conditions for preventing suicidal thoughts: (i) a high degree of belongingness, (ii) accessibility to help-related information, and (iii) healthy perceived cultural responses towards mental health. The implications are clear: to effectively tackle suicidal ideation among students, and broadly in other populations, requires a set of systematically coordinated programs.